View source for Aerial Combat

{{CombatPortal}}

=Aerial Combat Breakdown=
Aerial Combat is one of the [[Day Battle]] intermediary phases. In this phase, allied and enemy fleets indirectly fight each other for aerial dominance and airstrike potential, granting either fleet some substantial advantages in the subsequent combat phases.

Aerial Combat has the following structure:
#LBAS's [[Jet Assault]]
#Fleet's [[Jet Assault]]
#[[LBAS|Land-Based Aerial Support]]
#[[Air Power|Stage 1 - Battle for Air Superiority]]
#[[Anti-Air|Stage 2 - Fleet Anti-Air Defense]]
#[[Airstrike|Stage 3 - Airstrike]]

If an [[LBAS]] phase happens before the Aerial Combat phase, the enemy fleet state, such as plane slots and Fighter Power used for the subsequent Aerial Combat, is carried over. This can be used to tamper with the Enemy's Aerial Combat initial conditions. 
*''See [[LBAS]] for more details.

In case neither fleets meet the requirements, the sub-phase will be skipped.

{|class="wikitable mw-collapsible mw-collapsed" style="text-align:center" 
!colspan=7|Planes in combat phases
|-
!Plane type
!Detection
!Contact
!Airpower
!Opening airstrike
!Day Cut-in
!ASW
|-
|{{GreenPlane}}{{Night Fighter Aircraft}} [[Fighter]]s
|style="background-color:#ffb6c1"|❌ <!--Detection-->
|style="background-color:#ffb6c1"|❌ <!--Contact-->
|style="background-color:#90ee90"|✔️ <!--Air power-->
|style="background-color:#ffb6c1"|❌ <!--Airstrike-->
|style="background-color:#90ee90"|✔️ <!--Day Cut-in-->
|style="background-color:#ffb6c1"|❌ <!--ASW-->
|-
|{{BluePlane}}{{Night Torpedo Bomber}} [[Torpedo Bomber]]s
|style="background-color:#ffb6c1"|❌ <!--Detection-->
|style="background-color:#90ee90"|✔️ <!--Contact-->
|style="background-color:#90ee90"|✔️ <!--Air power-->
|style="background-color:#90ee90"|✔️ <!--Airstrike-->
|style="background-color:#90ee90"|✔️ <!--Day Cut-in-->
|style="background-color:#90ee90"|✔️ <!--ASW-->
|-
|{{RedPlane}} [[Dive Bomber]]s
|style="background-color:#ffb6c1"|❌ <!--Detection-->
|style="background-color:#ffb6c1"|❌ <!--Contact-->
|style="background-color:#90ee90"|✔️ <!--Air power-->
|style="background-color:#90ee90"|✔️ <!--Airstrike-->
|style="background-color:#90ee90"|✔️ <!--Day Cut-in-->
|style="background-color:#90ee90"|✔️ <!--ASW-->
|-
|{{JetFighterBomber1}}{{JetFighterBomber2}} [[:Category:Jet-powered Fighter-Bombers|Jets]]
|style="background-color:#ffb6c1"|❌ <!--Detection-->
|style="background-color:#ffb6c1"|❌ <!--Contact-->
|style="background-color:#90ee90"|✔️ <!--Air power-->
|style="background-color:#90ee90"|✔️ <!--Airstrike-->
|style="background-color:#ffb6c1"|❌ <!--Day Cut-in-->
|style="background-color:#ffb6c1"|❌ <!--ASW-->
|-
|{{YellowPlane}} [[Carrier Recon]]s
|style="background-color:#90ee90"|✔️ <!--Detection-->
|style="background-color:#90ee90"|✔️ <!--Contact-->
|style="background-color:#ffb6c1"|❌ <!--Air power-->
|style="background-color:#ffb6c1"|❌ <!--Airstrike-->
|style="background-color:#ffb6c1"|❌ <!--Day Cut-in-->
|style="background-color:#ffb6c1"|❌ <!--ASW-->
|-
|{{SPR}}{{Night Recon}} [[Seaplane Recon]]s
|style="background-color:#90ee90"|✔️ <!--Detection-->
|style="background-color:#90ee90"|✔️ <!--Contact-->
|style="background-color:#ffb6c1"|❌ <!--Air power-->
|style="background-color:#ffb6c1"|❌ <!--Airstrike-->
|style="background-color:#90ee90"|✔️ <!--Day Cut-in-->
|style="background-color:#ffb6c1"|❌ <!--ASW-->
|-
|{{SPB}}{{Night SPB}} [[Seaplane Bomber]]s
|style="background-color:#90ee90"|✔️ <!--Detection-->
|style="background-color:#ffb6c1"|❌ <!--Contact-->
|style="background-color:#90ee90"|✔️ <!--Air power-->
|style="background-color:#90ee90"|✔️ <!--Airstrike-->
|style="background-color:#90ee90"|✔️ <!--Day Cut-in-->
|style="background-color:#90ee90"|✔️ <!--ASW-->
|-
|{{SeaplaneFighter}} [[Seaplane Fighter]]s
|style="background-color:#ffb6c1"|❌ <!--Detection-->
|style="background-color:#ffb6c1"|❌ <!--Contact-->
|style="background-color:#90ee90"|✔️ <!--Air power-->
|style="background-color:#ffb6c1"|❌ <!--Airstrike-->
|style="background-color:#ffb6c1"|❌ <!--Day Cut-in-->
|style="background-color:#ffb6c1"|❌ <!--ASW-->
|-
|{{LargeFlyingBoat}} [[Large Flying Boat]]s
|style="background-color:#90ee90"|✔️ <!--Detection-->
|style="background-color:#90ee90"|✔️ <!--Contact-->
|style="background-color:#ffb6c1"|❌ <!--Air power-->
|style="background-color:#ffb6c1"|❌ <!--Airstrike-->
|style="background-color:#ffb6c1"|❌ <!--Day Cut-in-->
|style="background-color:#90ee90"|✔️ <!--ASW-->
|-
|{{Autogyro}} [[Rotorcraft]] 
|style="background-color:#ffb6c1"|❌ <!--Detection-->
|style="background-color:#ffb6c1"|❌ <!--Contact-->
|style="background-color:#90ee90"|✔️ <!--Air power-->
|style="background-color:#ffb6c1"|❌ <!--Airstrike-->
|style="background-color:#ffb6c1"|❌ <!--Day Cut-in-->
|style="background-color:#90ee90"|✔️ <!--ASW-->
|-
|{{ASWPlane}} [[Liaison Aircraft]]
|style="background-color:#ffb6c1"|❌ <!--Detection-->
|style="background-color:#ffb6c1"|❌ <!--Contact-->
|style="background-color:#90ee90"|✔️ <!--Air power-->
|style="background-color:#ffb6c1"|❌ <!--Airstrike-->
|style="background-color:#ffb6c1"|❌ <!--Day Cut-in-->
|style="background-color:#90ee90"|✔️ <!--ASW-->
|}

=[[Jets|Jet Assault]] Phase=

Planes that participate in this phase:
* {{Template:JetFighterBomber2}},{{Template:JetFighterBomber1}} "Jets" (turbojet propelled fighter-bombers) 

If any carrier on either side is equipped with [[Jets]], the Jet Assault (JA) Phase will commence first of all. The JA Phase may only commence during battles where '''Airstrikes''' can be performed. The JA follows the same rules as the Stage 3 - Airstrike phase.

The defending side is allowed to defend against the Jets following the same rules as the ones from Stage 2 - Fleet AA Defense, however, Jets possess great [[Anti-Air_Fire#Shoot_Down_Resistance|shootdown resistance]], specifically during the Jet Assault Phase.

Jets are not excluded from the Stage 3 - Airstrike phase, but in exchange, they are subject to enemy Anti-Air prior the JA, and again on Stage 2 - Fleet AA Defense.

'''Steel Cost:''' every time the Jet Assault Phase is triggered, {{Steel}} is ''automatically subtracted from the stockpile''.

<math>\text{Jet Phase Cost} = \sum^{\text{All Jets}} \lceil \text{Plane}_\text{Count} \times \text{Steel Cost} \rceil</math>

* <math>\text{Plane}_\text{Count}</math> is the current plane count '''at the start of the battle'''.
* <math>\text{Steel Cost}</math> is the steel cost per plane.
** [[Kikka Kai]]: '''2.6'''
** [[Jet Keiun Kai]]: '''2.8'''

=Stage 1 - Battle for Air Superiority=
[[File:Air_Superiority_Aquired.png|thumb|right|Green text at the bottom of the screen indicating an Air Supremacy result.]]

Planes that participate in this phase:
* Fighters:
** {{GreenPlane}}/{{Night Fighter Aircraft}} carrier-based,
** {{SeaplaneFighter}} seaplanes.
* Bombers
** {{RedPlane}}/{{BluePlane}}/{{Night Torpedo Bomber}}/{{JetFighterBomber1}}/{{JetFighterBomber2}} carrier-based,
** {{SPB}} seaplanes.

Following a possible Jet Phase, the fight for Air Supremacy will begin. The main objective of this phase is to define the '''Air State''' imposed on each fleet, by comparing each fleet's Air Power, more commonly referred to as '''Fighter Power (FP)'''.
*The Air State achieved can be critical, especially to trigger certain mechanics like [[Artillery Spotting]]/[[CVCI]], [[#Contact|Contact]], or [[Night Battle#Night Contact and Spotting|Night Contact]].

Fighter Power is defined by each plane equipped in the fleet that participates in this phase.

{|class="wikitable mw-collapsible mw-collapsed" width="100%"
!Fighter Power
|-
|
<math>\text{Fighter Power} = \sum^{\text{All planes}} \left[ \left(\text{AA}_\text{Plane} \times \sqrt{\text{Plane}_\text{Count}} \right) + \text{Mod}_\text{proficiency} \right]</math>

Where:
* <math>\text{AA}_\text{Plane}</math> is the {{AA}} AA stat of the plane, including [[Improvement]]s.
** [[Equipment Bonuses|Visible bonuses]] are not counted.
* <math>\text{Plane}_\text{Count}</math> is the number of planes in the slot prior to Stage 1's start.
* <math>\text{Mod}_\text{proficiency}</math> is the fighter-power proficiency bonus. For maxed proficiency {{Double Chevron}} planes it is:
** '''25.464''' for {{GreenPlane}}carrier-based [[Fighter]]s and {{SeaplaneFighter}}[[SPF|seaplane fighters]],
** '''9.464''' for {{SPB}}[[SPB|seaplane bombers]],
** '''3.464''' for all other planes.
** See ''[[Plane Proficiency]]'' for more details.
|}

After Fighter Power is calculated for each fleet ('''FP''' and '''EFP''' for allied and enemy fleets, respectively), the values are compared, and Air State is determined, based on the following:

{|class="wikitable" style="text-align:center; margin:auto" 
!width="130px"|Air State
!width="54px"|Fighter Power Range
!width="100px"|Allied Planes Shot Down
!width="80px"|Enemy Planes Shot Down
!width="64px"|Airstrike Contact
!width="64px"|Artillery Spotting
!width="120px"|Night Contact
|-
|style="color:green"| '''Air Supremacy (AS+)'''<br>制空権確保!
| <math>\text{FP} \ge 3\text{EFP}</math>
| 3/120 - 7/120
| 0% - 100%
| Allied Only
| Allied Only
| Allied Only
|-
|style="color:green"| '''Air Superiority (AS)'''<br>航空優勢!
| <math>3\text{EFP} > \text{FP} \ge 1.5\text{EFP}</math>
| 9/120 - 21/120
| 0% - 80%
| Allied & Enemy
| Allied Only
| Allied & Enemy
|-
| '''Air Parity (AP)'''<br>''No text''
| <math>1.5\text{EFP} > \text{FP} > \frac{2}{3}\text{EFP}</math>
| 15/120 - 35/120
| 0% - 60%
| Neither
| Neither
| Neither
|-
| '''Air Denial (AD)'''<br>''No text''
| <math>\frac{2}{3}\text{EFP} \ge \text{FP} > \frac{1}{3}\text{EFP}</math>
| 21/120 - 49/120
| 0% - 40%
| Allied & Enemy
| Enemy Only
| Allied & Enemy
|-
|style="color:red"| '''Air Incapability (AI)'''<br>制空権喪失! 
| <math>\frac{1}{3}\text{EFP} \ge \text{FP}</math>
| 30/120 - 70/120
| 0% - 10%
| Enemy Only
| Enemy Only
| Enemy Only 
|}

After determining it, each fleet will lose a random number of planes across all slots based on the imposed Air State.

{|class="wikitable mw-collapsible mw-collapsed" width="100%"
!Proportional Air State Shootdown Formulas
|-
|
For each slot of the '''Allied Fleet:'''

<math>\text{Plane Loss} = \left \lfloor

   \text{Plane}_\text{Count} \times
   \left[
      \text{random}
      \left( 
         0 ; \frac{\text{Mod}_\text{Air State}}{3}
      \right) + \frac{\text{Mod}_\text{Air State}}{4}
   \right] \times 0.1 \times \text{Mod}_\text{Jet}

\right \rfloor</math>

For each slot of the '''Enemy Fleet:'''

<math>\text{Plane Loss} = \left \lfloor \text{Plane}_\text{Count} \times \left( 0.035 \times \text{random} \left[ 0 ; A \right] + 0.065 \times  \text{random} \left[ 0 ; A \right] \right) \right \rfloor</math>

Where:
* <math>\text{Plane}_\text{Count}</math> is the plane's count in the slot.
* <math>\text{Mod}_\text{Air State}</math> is the Air State modifier for each side, with:
** {{color|green|'''AS+'''}}: 1
** {{color|green|'''AS'''}}: 2
** '''AP''': 5
** {{color|red|'''AD'''}}: 7
** {{color|red|'''AI'''}}: 10
* <math>\text{Mod}_\text{Jet}</math> is '''0.6''' for {{EquipmentLink|Kikka Kai|Jet Keiun Kai|text=Jets|link=Jets}}, '''1''' otherwise.
* The random function takes a random integer within the range in a linear distribution.
|}

;Notes
* Aircraft will be launched regardless of the carrier's state (except Sunk).
* The Air States between the allied and enemy fleets are mirrored. For example, attaining AS+ imposes AI to the enemy fleet.
* If both sides launch no planes, the Air State will be Air Parity.
* By solely using planes with no {{AA}} AA stat, an enemy fleet might start Air Supremacy Combat with 0 total Fighter Power.
** In such case, the allied fleet will attain AS+ even if no planes are launched.

=Stage 2 - Fleet Anti-Air Defense=
Planes that participate in this phase:
* Bombers
** {{RedPlane}}/{{BluePlane}}/{{Night Torpedo Bomber}}/{{JetFighterBomber1}}/{{JetFighterBomber2}} carrier-based,
** {{SPB}} seaplanes.
** {{ASWPlane}} [[Liaison Aircraft]] with {{Dive}} Dive Bombing stat.

Following Stage 1, the Fleet AA Defense phase allows each fleet to reduce the incoming Airstrike damage by shooting down enemy planes.
* Each bomber is assigned to a random enemy ship.
** Ships are picked regardless of damage state, ship class, and position in the fleet have no influence.
*** Even ships that cannot be targeted by airstrikes such as submarines can be chosen to defend against a given bomber.
*** Sunk ships cannot be chosen to defend<ref>https://twitter.com/Divinity_123/status/1564593185824841729</ref>, but sunk enemy ships can still activate [[#Anti-Air Cut-in|Anti-Air Cut-in]] for the fleet<ref>https://twitter.com/Divinity_123/status/1565631534362664960</ref>
* When a ship defends against a bomber, it rolls two concurrent but independent events, each with 50% chance of success:
** The first roll, denominated '''Proportional Shootdown''', or '''Prop''' for short, reduces the slot size by a given % value.
** The second roll, denominated '''Fixed Shootdown''', or '''Fixed''' for short, reduces the slot size by a given X value.
** There is therefore a chance of 25% to trigger both effects, 25% to trigger only Prop, 25% to trigger only Fixed, and 25% to trigger neither, for each bomber.
** Player-side ships are also guaranteed to shoot down at least +1 plane in addition to this, see [[#Anti-Air Cut-in|Anti-Air Cut-in]] for details.
<references/>

==Adjusted Anti-Air==
Adjusted Anti-Air is a set of values derived from each ship and the entire fleet. For a single ship, this value '''Ship Adjusted AA''' applies weights on different pieces of equipment to further increase its effectiveness against enemy air threats. For the fleet, this value '''Fleet Adjusted AA''' has the objective of further increasing the influence of particularly high Anti-Air ships on either side by strengthening the entire fleet's air defense performance.


{|class="wikitable mw-collapsible mw-collapsed" width="100%"
!Adjusted Anti-Air Formulas
|-
|
'''Allied Fleet:'''
*'''Ship Adjusted AA''' of each ship is defined by<ref>https://docs.google.com/document/d/1tqYyqzdc1RT_fYDKFMcUId0kOZHCdGpVsObm6yt-Yco/edit#heading=h.9md7m3uoezjq</ref>:
*<math>\text{AdjAA}_\text{ship} = \text{AA}_\text{ship} + \sum^{\text{All Equip}} \left( \text{AA}_\text{Equip} \times \text{Mod}_\text{Equip-Ship} + \text{AA}_\text{★-Equip} \right)</math>
* Then, if ship has any equipment equipped: <math>\text{AdjAA}_\text{ship} = 2 \times \bigg\lfloor\frac{\text{AdjAA}_\text{ship}}{2}\bigg\rfloor</math> (rounded down to the nearest multiple of 2)


*'''Fleet Adjusted AA''' is defined by:
*<math>\text{AdjAA}_\text{fleet} = \frac{2}{1.3} \times \Bigg\lfloor \text{Mod}_\text{Formation} \times \sum^{\text{All Ships}} \bigg\lfloor \sum^{\text{All equip}} ( \text{AA}_\text{Equip} \times \text{Mod}_\text{Equip-Fleet} + \text{AA}_\text{★-Fleet} ) \bigg\rfloor \Bigg\rfloor</math>


'''Enemy Fleet'''
*'''Ship Adjusted AA''' of each ship is defined by:
*<math>\text{AdjAA}_\text{enemy ship} = 2 \times \Bigg\lfloor \sqrt{\text{AA}_\text{ship} + \sum^{\text{All Equip}} \text{AA}_\text{Equip}} \Bigg\rfloor + \sum^{\text{All Equip}} ( \text{AA}_\text{Equip} \times \text{Mod}_\text{Equip-Ship} )</math>
* Then: <math>\text{AdjAA}_\text{enemy ship} = 2 \times \bigg\lfloor\frac{\text{AdjAA}_\text{enemy ship}}{2}\bigg\rfloor</math> (rounded down to the nearest multiple of 2)


*'''Fleet Adjusted AA''' is defined by:
*<math>\text{AdjAA}_\text{enemy fleet} = 2 \times \Bigg\lfloor \text{Mod}_\text{Formation} \times \sum^{\text{All Ships}} \bigg\lfloor \sum^{\text{All Equip}} ( \text{AA}_\text{Equip} \times \text{Mod}_\text{Equip-Fleet} ) \bigg\rfloor \Bigg\rfloor</math>


With:
* <math>\text{AA}_\text{ship}</math> the base {{AA}} AA stat of the ship.
* <math>\text{AA}_\text{Equip}</math> the {{AA}} AA stat of the equipment
** [[Equipment Bonuses|Visible bonuses]] are included to some extent, but actual amount is unconfirmed<ref>Estimated to be about 0.75-0.8 but not a precise fit: https://twitter.com/nishikkuma/status/1555196188621946884</ref>
* <math>\text{AA}_\text{★-Equip}</math> the "equipment" {{AA}} AA stat gained from [[Improvement]]s.
* <math>\text{AA}_\text{★-Fleet}</math> the "fleet" {{AA}} AA stat gained from [[Improvement]]s.
* <math>\text{Mod}_\text{Formation}</math> the Formation modifier. ''See [[Combat#Formation Selection|Combat]] for more details.''
* <math>\text{Mod}_\text{Equip-XX}</math> the equipment type modifier, with each value used in their respective formulas:

{|class="wikitable" style="margin:auto; text-align:center"
!Equipment Type
!<math>\text{Mod}_\text{Equip-Ship}</math>
!<math>\text{Mod}_\text{Equip-Fleet}</math>
|-
!{{GreenGunDP}}{{AntiAircraftFireDirector}}<br>[[High-Angle Gun]]s, {{Equipment/Link|Type 91 Anti-Aircraft Fire Director|Type 94 Anti-Aircraft Fire Director|text=AAFD|link_category=Anti-Aircraft Fire Director}}
|4||0.35
|-
!{{Radar}}<br>[[Radar]]s
|3||0.4
|-
!{{GreenAmmo}}<br>{{Equipment/Link|Type 3 Shell|Type 3 Shell Kai|Type 3 Shell Kai Ni|text=AA Shells|link_category=Anti-Aircraft Shells}}
|0||0.6
|-
!{{RedGunHeavy}}<br>{{EquipmentLink|46cm Triple Gun Mount}}<ref>Other guns like the {{EquipmentLink|Prototype 46cm Twin Gun Mount|46cm Triple Gun Mount Kai|text=46 cm variants}} are untested.</ref>
|0||0.25
|-
!{{GreenGunMG}}<br>[[AA Gun]]s
|6||rowspan=3|0.2
|-
![[:Category:Player equipment|All other equipment]]
|0
|-
!Other Abyssal AA Equipment<br>Including CIC, HA Single-Guns
|0
|}
<references/>
|}

==Proportional and Fixed shootdowns==
*'''Ship Adjusted AA''' is used to calculate '''Proportional shootdown'''.
*'''Ship Adjusted AA''' and '''Fleet Adjusted AA''' are used to calculate '''Fixed shootdown'''.

{|class="wikitable mw-collapsible mw-collapsed" width="100%"
!Prop/Fixed Shootdown Formulas
|-
|
'''Allied Fleet's ship''':

*<math>\text{Prop}= \left \lfloor \frac{\lfloor\text{AdjAA}_\text{ship} \times \text{AAR}_\text{ship}\rfloor \times \text{Mod}_\text{CF}}{400} \times \text{Plane}_\text{Count} \right \rfloor</math>

*<math>\text{Fixed}= \left \lfloor \frac{ \left( \lfloor \text{AdjAA}_\text{ship} \times \text{AAR}_\text{ship} \rfloor + \lfloor \text{AdjAA}_\text{fleet} \times \text{AAR}_\text{fleet} \rfloor \right) \times \text{Mod}_\text{CF} \times \text{K}_\text{value}}{10} \right \rfloor</math>


'''Enemy Fleet's ship''':

*<math>\text{Prop}= \left \lfloor \frac{\lfloor\text{AdjAA}_\text{enemy ship} \times \text{AAR}_\text{ship}\rfloor \times \text{Mod}_\text{CF}}{400} \times \text{Plane}_\text{Count} \right \rfloor</math>

*<math>\text{Fixed}= \Bigg\lfloor \frac{ \left( \lfloor \text{AdjAA}_\text{enemy ship} \times \text{AAR}_\text{ship} \rfloor + \lfloor \text{AdjAA}_\text{enemy fleet} \times \text{AAR}_\text{fleet} \rfloor \right) \times \text{Mod}_\text{CF} \times \text{K}_\text{value} \times 0.75 }{8} \Bigg\rfloor</math>

With:
* <math>\text{AdjAA}_\text{xx}</math> the previously calculated '''[[#Adjusted Anti-Air|Adjusted Anti-Air]]'''.
* <math>\text{Plane}_\text{Count}</math> the current number of attacking planes.
* <math>\text{Mod}_\text{CF}</math> the [[Combined Fleet]] modifier, being:
** '''1''' in Single Fleets
** '''0.8''' if the ship is in a CF's main fleet on Surface Nodes
** '''0.72''' if the ship is in a CF's main fleet on Air Raid Nodes
** '''0.48''' if the ship is in a CF's escort fleet
* <math>\text{K}_\text{value}</math> the Anti Air Cut-in (AACI) multiplier.
** '''1''' if no AACI triggers
** See [[#Anti-Air Cut-in|K-value column of AACI Patterns]] for values.
* <math>\text{AAR}_\text{ship}</math> the attacking plane's '''Ship AA Resist'''.
* <math>\text{AAR}_\text{fleet}</math> the attacking plane's '''Fleet AA Resist'''.
|}

{|class="wikitable mw-collapsible mw-collapsed" width="100%"
!Guaranteed Shootdown Formula
|-
|
*<math>\text{Guaranteed}= \lfloor \text{AACI}_\text{shotA} \times \text{AAR}_\text{AACI} \rfloor + \text{AACI}_\text{shotB}</math>

With:
* <math>\text{AAR}_\text{AACI}</math> the attacking plane's '''AACI Resist'''.
**Value is suspected to be equal to <math>\text{AAR}_\text{ship}</math>, but not confirmed for all planes.<ref>https://github.com/noro6/kc-web/blob/main/src/classes/aerialCombat/shootDownInfo.ts#L115</ref>
* <math>\text{AACI}_\text{shotA}</math> and <math>\text{AACI}_\text{shotB}</math> are Anti Air Cut-in (AACI) Shot-down values
** See [[#Anti-Air Cut-in|Shot down per slot column of AACI Patterns]] for values in tooltips.
*** Player fleet uses <math>\text{AACI}_\text{shotA} = 1</math>, <math>\text{AACI}_\text{shotB} = 0</math> if no AACI triggered
*** Enemy fleet uses <math>\text{AACI}_\text{shotA} = 0</math>, <math>\text{AACI}_\text{shotB} = 0</math> if no AACI triggered
*** Values for API values after 13 are unconfirmed

<references/>
|}

===Anti-Air Resistance===
{{Category:Planes with Anti-Air Resistance}}

==Anti-Air Cut-in==
[[File:AkizukiAACI.png|thumb|right|Akizuki performing the API 1 (HHR) AACI.]]
Using special equipment setups, ships may perform one of multiple special anti-air maneuvers during Stage 2. These moves are often referred to as AA Cut-ins, or '''AACI''' due to the way the equipment is displayed in the screen before they are performed. Particular AACI are often referred to by their acronym, such as BBR for AACI 5.

AACI grants a multiplier to the Fixed Shootdown of all Allied Fleet ships regardless of what ship uses it, referred to as ''K-value''. On top of that effect, AACI will remove a fixed number of planes from each enemy bomber slot. These effects make depleting the entirety of enemy bombers much more feasible.

Although several ships can be equipped with a proper AACI setup, '''only one ship can perform an AACI'''. ''If Stage 2 happens multiple times, like in an Air Battle node, then each Air Phase's Stage 2 might roll an AACI.''

If the enemy fleet has a valid setup, it may as well activate an AACI. If that happens, an animation will not be shown, but the effects will function normally. It can activate during the regular airstrike phase, but not during LBAS phases.
* There is a bug that allows enemy ships to activate AACI even if they were sunk<ref>https://twitter.com/Divinity_123/status/1565631534362664960</ref>.

The trigger chance of a given AACI is solely determined by its API value, and is arbitrary. Fleet AA, Ship AA, Adjusted AA, Air State, or any other parameter like Luck and LoS '''have no bearing in AACI trigger rates.''' Most trigger chances were datamined from KanColle Vita, and tests in the Browser version corroborated the results.

*{{GreenGunDP}} is used to indicate any '''[[High-Angle Gun]]''' (dual-purpose guns/HA guns), including [[:Category:Main High-Angle Gun|Main HA Guns]] and [[:Category:Secondary High-Angle Gun|Secondary HA Guns]]

*{{AntiAircraftFireDirector}} is used to indicate any '''{{Equipment/Link|Type 91 Anti-Aircraft Fire Director|Type 94 Anti-Aircraft Fire Director|text=AA Fire Directors|link_category=Anti-Aircraft Fire Directors}}'''.

* {{GreenGunMG}} is used to indicate any '''[[AA Gun]]'''.

* {{Air Radar}} is used to indicate an '''[[Air Radar]]'''.
** Any Radar with {{AA}} AA stat of 2 or higher is considered an Air Radar, even if not explicitly stated by the game.

{{Anchor|AACI}}
{|class="wikitable" style="text-align: center; margin:auto"
! colspan=7|AACI Patterns
|-
! API value
! width="300px"|Type
! width="80px"|Shot down<br>per slot
! width="64px"|K-value
! width="64px"|Rate
! User
! Notes
|-
!None
|'''-'''
|{{ToolTip|'''+1'''|A <nowiki>=</nowiki> 1, B <nowiki>=</nowiki> 0}}
|1.0
|N/A
|Player's fleet only
|Triggers if no other AACI is activated
|-
!1
|nowrap|'''HHR'''<br>{{GreenGunDP}} {{GreenGunDP}} {{Air Radar}}
|{{ToolTip|'''+8'''|A <nowiki>=</nowiki> 3, B <nowiki>=</nowiki> 5}}
|nowrap|1.7
|65%
|rowspan=3|'''{{Ship/Link|Akizuki|Teruzuki|Suzutsuki|Hatsuzuki|Fuyutsuki|link_class=Akizuki|text=''Akizuki''-class}}'''
|'''HA guns x2 + Air Radar'''
|-
!2
|nowrap|HR<br>{{GreenGunDP}} {{Air Radar}}
|{{ToolTip|+7|A <nowiki>=</nowiki> 3, B <nowiki>=</nowiki> 4}}
|1.7
|58%
|HA guns + Air Radar
|-
!3
|nowrap|HH<br>{{GreenGunDP}} {{GreenGunDP}}
|{{ToolTip|+5|A <nowiki>=</nowiki> 2, B <nowiki>=</nowiki> 3}}
|1.6
|50%
|HA guns x2
|-
!4
|nowrap|MSAR<br>{{RedGunHeavy}} {{GreenAmmo}} {{AntiAircraftFireDirector}}{{Air Radar}}
|{{ToolTip|+7|A <nowiki>=</nowiki> 5, B <nowiki>=</nowiki> 2}}
|1.5
|52%
|'''Battleships'''
|Large Main Gun + [[AA Shell]] + AAFD + Air Radar
|-
!5
|nowrap|'''BBR'''<br>{{IconText|{{GreenGunDP}}|8+ AA|9}} {{IconText|{{GreenGunDP}}|8+ AA|9}} {{Air Radar}}
|{{ToolTip|'''+5'''|A <nowiki>=</nowiki> 2, B <nowiki>=</nowiki> 3}}
|nowrap|1.5
|55%
|'''All'''
|'''HA guns (≥8 AA) x2 + Air Radar''' 
|-
!6
|nowrap|MSA<br>{{RedGunHeavy}} {{GreenAmmo}} {{AntiAircraftFireDirector}}
|{{ToolTip|+5|A <nowiki>=</nowiki> 4, B <nowiki>=</nowiki> 1}}
|nowrap|1.45
|40%
|'''Battleships'''
|Large Main Gun + [[AA Shell]] + AAFD
|-
!7
|nowrap|HAR<br>{{GreenGunDP}} {{AntiAircraftFireDirector}} {{Air Radar}}
|{{ToolTip|+4|A <nowiki>=</nowiki> 2, B <nowiki>=</nowiki> 2}}
|1.35
|45%
|rowspan=3|'''All'''
|HA guns + AAFD + Air Radar
|-
!8
|nowrap|BR<br>{{IconText|{{GreenGunDP}}|8+ AA|9}} {{Air Radar}}
|{{ToolTip|+5|A <nowiki>=</nowiki> 2, B <nowiki>=</nowiki> 3}}
|nowrap|1.4
|50%
|HA guns (≥8 AA) + Air Radar
|-
!9
|nowrap|HA<br>{{GreenGunDP}} {{AntiAircraftFireDirector}}
|{{ToolTip|+3|A <nowiki>=</nowiki> 1, B <nowiki>=</nowiki> 2}}
|1.3
|40%
|HA guns + AAFD
|-
!10
|nowrap|'''HCR'''<br>{{GreenGunDP}} {{IconText|{{GreenGunMG}}|9+ AA|9}} {{Air Radar}}
|{{ToolTip|'''+9'''|A <nowiki>=</nowiki> 3, B <nowiki>=</nowiki> 6}}
|1.65
|60%
|rowspan=2|'''{{Ship/Link|Maya/Kai Ni}}'''
|'''HA guns + AA Gun (≥9 AA) + Air Radar'''
|-
!11
|nowrap|HC<br>{{GreenGunDP}} {{IconText|{{GreenGunMG}}|9+ AA|9}}
|{{ToolTip|+7|A <nowiki>=</nowiki> 2, B <nowiki>=</nowiki> 5}}
|1.5
|55%
|HA guns + AA Gun (≥9 AA)
|-
!12
|nowrap|CGR<br>{{IconText|{{GreenGunMG}}|9+ AA|9}} {{IconText|{{GreenGunMG}}|3+ AA|9}} {{Air Radar}}
|{{ToolTip|+4|A <nowiki>=</nowiki> 1, B <nowiki>=</nowiki> 3}}
|1.25
|45%
|'''All'''
|AA Gun (≥9 AA) + AA Gun (≥3 AA) + Air Radar
|-
!13
|style="color:black;background-color:#eaecf0"|'''Cannot be activated''':<br>{{IconText|{{GreenGunDP}}|8+ AA|9}} {{IconText|{{GreenGunMG}}|9+ AA|9}} {{Air Radar}}
|style="color:black;background-color:#eaecf0"|{{ToolTip|+5|A <nowiki>=</nowiki> 1, B <nowiki>=</nowiki> 4}}
|style="color:black;background-color:#eaecf0"|1.35
|style="color:black;background-color:#eaecf0"|35%
|style="color:black;background-color:#eaecf0"|All except '''{{Ship/Link|Maya/Kai Ni}}'''
|style="color:black;background-color:#eaecf0"|HA guns (≥8 AA) + AA Gun (≥9 AA) + Air Radar
|-
!14
|nowrap|HGR<br>{{GreenGunDP}} {{GreenGunMG}} {{Air Radar}}
|nowrap| +5
|1.45
|62%
|rowspan=2|'''{{Ship/Link|Isuzu/Kai Ni}}'''
|HA guns + AA Gun + Air Radar
|-
!15
|nowrap|HG<br>{{GreenGunDP}} {{GreenGunMG}}
| +4
|1.3
|55%
|HA guns + AA Gun
|-
!16
|nowrap|HGR<br>{{GreenGunDP}} {{GreenGunMG}} {{Air Radar}}
| +5
|1.4
|62%
|nowrap|'''{{Ship/Link|Kasumi/Kai Ni B}} &'''<br>'''{{Ship/Link|Yuubari/Kai Ni}}''' (not {{Ship/Link|Yuubari/Kai Ni Toku|Yuubari/Kai Ni D|text=Toku/D}})
|HA guns + AA Gun + Air Radar
|-
!17
|nowrap|HG<br>{{GreenGunDP}} {{GreenGunMG}}
| +3
|1.25
|55%
|'''{{Ship/Link|Kasumi/Kai Ni B}}'''
|HA guns + AA Gun
|-
!18
|nowrap|C<br>{{IconText|{{GreenGunMG}}|9+ AA|9}}
| +3
|1.2
|60%
|'''{{Ship/Link|Satsuki/Kai Ni}}'''
|AA Gun (≥9 AA)
|-
!19
|nowrap|HC<br>{{IconText|{{GreenGunDP}}|7- AA|9}} {{IconText|{{GreenGunMG}}|9+ AA|9}}
| +6
|1.45
|58%
|rowspan=2|'''{{Ship/Link|Kinu/Kai Ni}}'''
|HA guns (≤7 AA) + AA Gun (≥9 AA)
|-
!20
|nowrap|C<br>{{IconText|{{GreenGunMG}}|9+ AA|10}}
| +4
|1.25
|65%
|AA Gun (≥9 AA)
|-
!21
|nowrap|HR<br>{{GreenGunDP}} {{Air Radar}}
| +6
|1.45
|60%
|'''{{Ship/Link|Yura/Kai Ni}}'''
|HA guns + Air Radar
|-
!22
|nowrap|C<br>{{IconText|{{GreenGunMG}}|9+ AA|9}}
| +3
|1.2
|60%
|'''{{Ship/Link|Fumizuki/Kai Ni}}'''
|AA Gun (≥9 AA)
|-
!23
|nowrap|G<br>{{IconText|{{GreenGunMG}}|3~8 AA|9}}
| +2
|1.05
|80%
|'''{{Ship/Link|UIT-25|I-504|text=UIT-25/I-504}}'''
|AA Gun (3 to 8 AA)
|-
!24
|nowrap|HG<br>{{GreenGunDP}} {{IconText|{{GreenGunMG}}|3~8 AA|9}}
| +4
|1.25
|40%
|'''{{Ship/Link|Tenryuu/Kai Ni|Tatsuta/Kai Ni|text=''Tenryuu''-class Kai Ni|link_class=Tenryuu}}'''
|HA guns + AA Gun (3 to 8 AA)
|-
!25
|{{Equipment/Card|12cm 30-tube Rocket Launcher Kai Ni|size=70px}} {{Air Radar}} {{GreenAmmo}}
| +8
|1.55
|60%
|'''{{Ship/Link|Ise/Kai|Ise/Kai Ni|Hyuuga/Kai|Hyuuga/Kai Ni|text=''Ise''-class Kai/Ni|link_class=Ise}}'''
|{{Equipment/Link|12cm 30-tube Rocket Launcher Kai Ni|text=RLK2}} + Air Radar + [[AA Shell]]
|-
!26
|nowrap|{{Equipment/Card|10cm Twin High-angle Gun Mount Kai + Additional Machine Guns|size=70px}} {{Air Radar}}
| +7
|1.4
|55%
|'''{{Ship/Link|Yamato/Kai Ni|Yamato/Kai Ni Juu|Musashi/Kai Ni|text=''Yamato''-class Kai Ni|link_class=Yamato}}'''
|{{Equipment/Link|10cm Twin High-angle Gun Mount Kai + Additional Machine Guns|text=10cm Twin HA Mount Kai}} + Air Radar
|-
!27
|nowrap|{{Equipment/Card|10cm Twin High-angle Gun Mount Kai + Additional Machine Guns|size=70px}} {{Equipment/Card|12cm 30-tube Rocket Launcher Kai Ni|size=70px}} {{Air Radar}}
| +6
|1.55
|55% {{ToolTip|(5%)|when accounting for API 8 rate}}
|'''{{Ship/Link|Ooyodo/Kai}}'''
|{{Equipment/Link|10cm Twin High-angle Gun Mount Kai + Additional Machine Guns|text=10cm Twin HA Mount Kai}} + {{Equipment/Link|12cm 30-tube Rocket Launcher Kai Ni|text=RLK2}} + Air Radar
|-
!28
|{{Equipment/Card|12cm 30-tube Rocket Launcher Kai Ni|size=70px}} {{Air Radar}}
| +5
|1.4
|55%
|'''{{Ship/Link|Ise/Kai|Ise/Kai Ni|Hyuuga/Kai|Hyuuga/Kai Ni|text=''Ise''-class Kai/Ni|link_class=Ise}} &<br>{{Ship/Link|Musashi/Kai|Musashi/Kai Ni|text=Musashi Kai/Ni}}'''
|{{Equipment/Link|12cm 30-tube Rocket Launcher Kai Ni|text=RLK2}} + Air Radar
|-
!29
|nowrap|HR<br>{{GreenGunDP}} {{Air Radar}}
| +6
|1.55
|60%
|'''{{Ship/Link|Hamakaze/B Kai}} &<br>{{Ship/Link|Isokaze/B Kai}}'''
|HA guns + Air Radar<br>''Using '''HA guns (≥8 AA)''' has a high chance to proc AACI 5/8 instead.''
|-
!30
|nowrap|HHH<br>{{GreenGunDP}} {{GreenGunDP}} {{GreenGunDP}}
| +4
|1.3
|45%
|'''{{Ship/Link|Tenryuu/Kai Ni}} &'''<br>'''{{Ship/Link|Gotland/Kai|Gotland/Andra|text=Gotland Kai/Andra}}'''
|HA guns x3
|-
!31
|nowrap|HH<br>{{GreenGunDP}} {{GreenGunDP}}
| +3
|1.2
|52%
|'''{{Ship/Link|Tenryuu/Kai Ni}}'''
|HA guns x2
|-
!32
|{{Equipment/Card|16inch Mk.I Triple Gun Mount Kai + FCR Type 284|size=70px}} {{Equipment/Card|QF 2-pounder Octuple Pom-pom Gun Mount|size=70px}}<br>'''OR'''<br>{{Equipment/Card|20-tube 7inch UP Rocket Launchers|size=70px}} {{Equipment/Card|QF 2-pounder Octuple Pom-pom Gun Mount|size=70px}}<br>'''OR'''<br>{{Equipment/Card|20-tube 7inch UP Rocket Launchers|size=70px}} {{Equipment/Card|20-tube 7inch UP Rocket Launchers|size=70px}}
| +4
|1.2
|50%
|'''[[RN|Royal Navy Ships]] &<br> {{Ship/Link|Kongou/Kai Ni|Kongou/Kai Ni C|Hiei/Kai Ni|Hiei/Kai Ni C|Kirishima/Kai Ni|Haruna/Kai Ni|text=''Kongou''-class Kai Ni/C|link_class=Kongou}}'''
|{{Equipment/Link|16inch Mk.I Triple Gun Mount Kai + FCR Type 284|text=16inch Mk.I Triple + FCR}} + {{Equipment/Link|QF 2-pounder Octuple Pom-pom Gun Mount|text=QF 2-pounder}} <br>'''OR'''<br> {{Equipment/Link|20-tube 7inch UP Rocket Launchers|text=20-tube 7inch UP}} + {{Equipment/Link|20-tube 7inch UP Rocket Launchers|text=20-tube 7inch UP}} / {{Equipment/Link|QF 2-pounder Octuple Pom-pom Gun Mount|text=QF 2-pounder}}
|-
!33
|nowrap|HG<br>{{GreenGunDP}} {{IconText|{{GreenGunMG}}|4+ AA|9}}
| +4
|1.35
|45%
|'''{{Ship/Link|Gotland/Kai|Gotland/Andra|text=Gotland Kai/Andra}}'''
|HA guns + AA Gun (≥4 AA)
|-
!34
|{{Equipment/Card|5inch Single Gun Mount Mk.30 Kai + GFCS Mk.37|size=70px}} {{Equipment/Card|5inch Single Gun Mount Mk.30 Kai + GFCS Mk.37|size=70px}}
|'''+8'''
|1.6
|55%
|rowspan=4|'''{{Class|Fletcher}}
|2 {{Equipment/Link|5inch Single Gun Mount Mk.30 Kai + GFCS Mk.37|text=5inch Mk.30 + GFCS Mk.37}} 
|-
!35
|{{Equipment/Card|5inch Single Gun Mount Mk.30 Kai + GFCS Mk.37|size=70px}} {{Equipment/Card|5inch Single Gun Mount Mk.30|size=70px}}<br>'''OR'''<br>{{Equipment/Card|5inch Single Gun Mount Mk.30 Kai + GFCS Mk.37|size=70px}} {{Equipment/Card|5inch Single Gun Mount Mk.30 Kai|size=70px}}
|'''+7'''
|1.55
|55%
|{{Equipment/Link|5inch Single Gun Mount Mk.30 Kai + GFCS Mk.37|text=5inch Mk.30 + GFCS Mk.37}} + {{Equipment/Link|5inch Single Gun Mount Mk.30}} / {{Equipment/Link|5inch Single Gun Mount Mk.30 Kai|text=Kai}}
|-
!36
|{{Equipment/Card|5inch Single Gun Mount Mk.30|size=70px}} {{Equipment/Card|5inch Single Gun Mount Mk.30|size=70px}} {{Equipment/Card|GFCS Mk.37|size=70px}}<br>'''OR'''<br>{{Equipment/Card|5inch Single Gun Mount Mk.30 Kai|size=70px}} {{Equipment/Card|5inch Single Gun Mount Mk.30|size=70px}} {{Equipment/Card|GFCS Mk.37|size=70px}}<br>'''OR'''<br>{{Equipment/Card|5inch Single Gun Mount Mk.30 Kai|size=70px}} {{Equipment/Card|5inch Single Gun Mount Mk.30 Kai|size=70px}} {{Equipment/Card|GFCS Mk.37|size=70px}}
|'''+7'''
|1.55
|50%
|2 {{Equipment/Link|5inch Single Gun Mount Mk.30}} / {{Equipment/Link|5inch Single Gun Mount Mk.30 Kai|text=Kai}} + {{Equipment/Link|GFCS Mk.37}}
|-
!37
|{{Equipment/Card|5inch Single Gun Mount Mk.30 Kai|size=70px}} {{Equipment/Card|5inch Single Gun Mount Mk.30 Kai|size=70px}}
| +5
|1.45
|40%
|2 {{Equipment/Link|5inch Single Gun Mount Mk.30 Kai}} (not base)
|-
!38
|{{Equipment/Card|GFCS Mk.37 + 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment)|size=70px}} {{Equipment/Card|GFCS Mk.37 + 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment)|size=70px}}
|'''+11'''
|1.85
|57%
|rowspan=4|'''{{Ship/Link|Atlanta|text=''Atlanta''-class|link_class=Atlanta}}'''
|2 {{Equipment/Link|GFCS Mk.37 + 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment)|text=GFCS Mk.37 + 5inch Twin CD}}
|-
!39
|{{Equipment/Card|GFCS Mk.37 + 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment)|size=70px}} {{Equipment/Card|5inch Twin Dual-purpose Gun Mount (Concentrated Deployment)|size=70px}}
|'''+11'''
|1.7
|57%
|{{Equipment/Link|GFCS Mk.37 + 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment)|text=GFCS Mk.37 + 5inch Twin CD}} + {{Equipment/Link|5inch Twin Dual-purpose Gun Mount (Concentrated Deployment)|text=5inch Twin CD}}
|-
!40
|{{Equipment/Card|5inch Twin Dual-purpose Gun Mount (Concentrated Deployment)|size=70px}} {{Equipment/Card|5inch Twin Dual-purpose Gun Mount (Concentrated Deployment)|size=70px}} {{Equipment/Card|GFCS Mk.37|size=70px}}<br>'''OR'''<br>{{Equipment/Card|5inch Twin Dual-purpose Gun Mount (Concentrated Deployment)|size=70px}} {{Equipment/Card|GFCS Mk.37 + 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment)|size=70px}} {{Equipment/Card|GFCS Mk.37|size=70px}}<br>'''OR'''<br>{{Equipment/Card|GFCS Mk.37 + 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment)|size=70px}} {{Equipment/Card|GFCS Mk.37 + 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment)|size=70px}} {{Equipment/Card|GFCS Mk.37|size=70px}}
|'''+11'''
|1.7
|56%
|2 {{Equipment/Link|5inch Twin Dual-purpose Gun Mount (Concentrated Deployment)|text=5inch Twin CD}} / {{Equipment/Link|GFCS Mk.37 + 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment)|text=GFCS Mk.37 + 5inch Twin CD}} + {{Equipment/Link|GFCS Mk.37}}
|-
!41
|{{Equipment/Card|5inch Twin Dual-purpose Gun Mount (Concentrated Deployment)|size=70px}} {{Equipment/Card|5inch Twin Dual-purpose Gun Mount (Concentrated Deployment)|size=70px}}<br>'''OR'''<br>{{Equipment/Card|GFCS Mk.37 + 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment)|size=70px}} {{Equipment/Card|5inch Twin Dual-purpose Gun Mount (Concentrated Deployment)|size=70px}}<br>'''OR'''<br>{{Equipment/Card|GFCS Mk.37 + 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment)|size=70px}} {{Equipment/Card|GFCS Mk.37 + 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment)|size=70px}}
|'''+10'''
|1.65
|55%
|2 {{Equipment/Link|5inch Twin Dual-purpose Gun Mount (Concentrated Deployment)|text=5inch Twin CD}} / {{Equipment/Link|GFCS Mk.37 + 5inch Twin Dual-purpose Gun Mount (Concentrated Deployment)|text=GFCS Mk.37 + 5inch Twin CD}}
|-
!42
|{{Equipment/Card|10cm Twin High-angle Gun Mount Battery Concentrated Deployment|size=70px}} {{Equipment/Card|10cm Twin High-angle Gun Mount Battery Concentrated Deployment|size=70px}} {{Very Large Radar}} {{IconText|{{GreenGunMG}}|6+ AA|9}}
|'''+11'''
|1.65
|?%
|rowspan=4|'''{{Ship/Link|Yamato/Kai Ni|Yamato/Kai Ni Juu|Musashi/Kai Ni|text=''Yamato''-class Kai Ni|link_class=Yamato}}'''
|rowspan=4|{{Equipment/Link|15m Duplex Rangefinder + Type 21 Radar Kai Ni|15m Duplex Rangefinder Kai + Type 21 Radar Kai Ni + Skilled Fire Direction Center|text=Very large radar|link_category=Very Large Radar}} + 1 or 2 {{Equipment/Link|10cm Twin High-angle Gun Mount Battery Concentrated Deployment|text=10cm Twin HA Gun CD}} + 0 or 1 AA Gun (≥6 AA)
|-
!43
|{{Equipment/Card|10cm Twin High-angle Gun Mount Battery Concentrated Deployment|size=70px}} {{Equipment/Card|10cm Twin High-angle Gun Mount Battery Concentrated Deployment|size=70px}} {{Very Large Radar}}
|'''+9'''
|1.6
|?%
|-
!44
|{{Equipment/Card|10cm Twin High-angle Gun Mount Battery Concentrated Deployment|size=70px}} {{Very Large Radar}} {{IconText|{{GreenGunMG}}|6+ AA|9}}
|'''+7'''
|1.6
|?%
|-
!45
|{{Equipment/Card|10cm Twin High-angle Gun Mount Battery Concentrated Deployment|size=70px}} {{Very Large Radar}}
|'''+6'''
|1.55
|?%
|}

;Notes
* '''If multiple ships can trigger AACI, the ship that rolls the highest API number takes priority.'''
** If API numbers are tied, priority goes by fleet slot order from top to bottom.
* '''If a single ship fulfills multiple AACI requirements:'''
** A '''single roll''' is done to check for all AACIs.
** This means that an AACI with higher priority and higher trigger rate completely blocks lower priority AACI from activating.
*** For example, Akizuki with a {{IconText|{{GreenGunDP}}|8+ AA|9}}{{IconText|{{GreenGunDP}}|8+ AA|9}}{{Air Radar}} setup fulfills the requirements of the AACIs with API values 1, 2, 3, 5, and 8, with 1 being the highest priority. Due to this, the only API that Akizuki can trigger is 1, because a success will activate it, and a failure implies that the roll wouldn't meet the 58%, 50%, 55%, and 50% trigger rates as it has failed to meet a 65% rate roll.
** Conversely, an AACI with lower priority but higher trigger rate has a chance of occurring, if the roll fails to pass the higher priority AACI.
*** For example, Isokaze B Kai with {{IconText|{{GreenGunDP}}|8+ AA|9}}{{IconText|{{GreenGunDP}}|8+ AA|9}}{{Air Radar}} fulfils 5 (55% rate) and 29 (60% rate), with 5 having priority. This means that in total, 5 will occur 55% of the time, and 29 will occur the leftover 5% of the time (60% - 55%).
** Priority is: '''(1 > 2 > 3, 10 > 11, 14 > 15, 16 > 17, 19, 21, 25, 42 > 43 > 44 > 45) > 4 > 5 > 6 > 8 > 7 > (26 > 27 > 28, 29) > 9 > (33) > 12 > 13 > (18, 20, 22, 23, 30 > 31 > 24, 32)'''<ref name="aaci1">https://docs.google.com/spreadsheets/d/1YUppVErQj7P9f9-ddpdR-e7fTaycjSK9-x4GE9ibCrA/edit#gid=1156988467, TsunDB</ref><ref name="YamatoK2">https://twitter.com/syoukuretin/status/1535102184530276352</ref>
*** Examples:
**** [[Kinu Kai Ni]] can trigger both API 20 and 19.
**** The same ship can activate APIs 20, 5, and 29.
*** Note: At some point during 2018-2019(?), priority was changed from '''7 > 8''' to '''8 > 7'''. Prior to this, both 7 and 8 could be triggered with {{IconText|{{GreenGunDP}}|8+ AA|9}}{{AntiAircraftFireDirector}}{{Air Radar}}<ref>https://gyazo.com/2472468c10c0dacd28a493a79ff140da</ref>, whereas now only 8 can be triggered.

===Sequential AACIs===
The '''Sequential AACIs''' are the Cut-ins introduced with the implementation of [[Johnston]] onwards. So far, they are exclusive to the {{Ship/Link|Fletcher/Kai|Johnston/Kai|text=''Fletcher''-class|link_class=Fletcher}} and {{Ship/Link|Atlanta/Kai|text=''Atlanta''-class|link_class=Atlanta}}. Different from Original AACIs, each eligible AACI will be '''rolled independently''' if the previous roll has failed. If all Sequential rolls fail, an additional Original Type roll is performed. This grants the specific ships with access to Sequential AACIs extremely high combined trigger rates.
* Example: Atlanta with {{Equipment/Link|5inch Twin Dual-purpose Gun Mount (Concentrated Deployment)|text=5inch Twin CD}} + {{Equipment/Link|5inch Twin Dual-purpose Gun Mount (Concentrated Deployment)|text=5inch Twin CD}} + {{EquipmentLink|GFCS Mk.37|text=GFCS}} fulfils 39, 40, 41, and 5. Rolled independently, this gives 57% for 39, ~24% for 40, ~10.4% for 41, ~4.7% for 5, for a total of ~96% chance of some AACI occurring.
Sequential AACIs are, in order of priority: '''(34 > 35 > 37 > 36, 38 > 39 > 40 > 41) > (Original AACI)'''<ref name="aaci1"></ref>

<references/>

=Stage 3 - Airstrike=

Planes that participate in this phase:
* {{Seaplane}} Reconnaissance Seaplanes
* {{YellowPlane}} Carrier-based Reconnaissance Aircraft
* {{BluePlane}}{{RedPlane}}{{JetFighterBomber2}} Carrier-based Bombers
* {{Seaplane}} Seaplane Bombers
* {{ASWPlane}} [[Liaison Aircraft]] with {{Dive}} Dive Bombing stat.

With both preliminary phases executed, the final Aerial Combat Stage, Airstrike, is performed. In this phase, each bomber from the Allied Fleet and Enemy Fleet that still possess a slot size higher than 0 selects a ship to attack. The attack target is randomly picked following the same rules as [[Shelling]] target selection. The targeted ship is '''not necessarily''' the ship that has defended against said bomber during Stage 2.

See [[Damage_Calculations#Airstrike|Damage Calculations]] for details on airstrike damage.

;Notes
* Each bomber is assigned to a single ship and performs exactly one attack. The same ship may be selected to be attacked by multiple different bombers.
* The attack is unaffected by the battle's Engagement and the Fleet's Formation, as well as the Carrier's morale and damage state.
* Submarines are untargetable by Airstrike

==Contact==
[[file:Contact.png|thumb|right|Tenzan Model 12 (Murata Squadron) performing Contact against the Enemy Fleet.]]
Contact is a special mechanic that increases the damage of '''all bombers''' participating in the Airstrike Phase. Specifically, it may be triggered during Stage 1, but has no effects until Stage 3. When successful, the Squadron performing Contact will be shown on top of the opposing fleet's "Radar", together with the text '''Making contact!''' (触接中!, ''shokusetsu-chū!'').

* Contact may be triggered only under {{color|green|'''AS+'''}}, {{color|green|'''AS'''}}, and {{color|red|'''AD'''}}. It '''cannot''' trigger under '''AP''' and {{color|red|'''AI'''}}.
* At least one {{YellowPlane}} [[Carrier Recon]], {{BluePlane}}/{{Night Torpedo Bomber}} [[Torpedo Bomber]], {{SPR}}/{{Night Recon}} [[SPR|Seaplane Recon]], or {{Large Flying Boat}} [[Large Flying Boat]] must be present.
** {{SPB}} [[SPB|Seaplane Bombers]] '''cannot''' perform contact.

===Step 1: Contact Trigger===
This step determines if any contact can trigger at all. Each plane that can perform Contact '''except''' {{BluePlane}}/{{Night Torpedo Bomber}} [[Torpedo Bomber|Torpedo Bombers]] contributes an independent trigger rate based on the plane's {{LOS}} LoS stat and slot size. The Final Trigger Rate is determined using the sum of all independent trigger rates, and is also affected by Air State.
* If only {{BluePlane}}/{{Night Torpedo Bomber}} [[Torpedo Bomber|Torpedo Bombers]] are present, there is still a very small chance Contact Trigger can succeed.

{|class="wikitable mw-collapsible mw-collapsed" width="100%"
!Contact Trigger Rate Formula<ref name="vita">[[KanColle Kai]] decompile</ref>
|-
|
<math>\text{Contact Rate}= \frac{1 + \sum^{\text{All Planes}} \left( \lfloor \sqrt{\text{Plane}_\text{Count}} \times \text{LoS}_\text{Plane} \rfloor \right)} {\text{Mod}_\text{Air State}}
</math>

Where:
* <math>\text{All Planes}</math> refer only to all planes that can perform Contact ({{YellowPlane}}/{{SPR}}/{{Night Recon}}/{{Large Flying Boat}}) '''except''' Torpedo Bombers ({{BluePlane}}/{{Night Torpedo Bomber}}).
* <math>\text{Plane}_\text{Count}</math> is the current plane's slot size.
* <math>\text{LoS}_\text{Plane}</math> is the plane's displayed {{LOS}} LoS stat.
* <math>\text{Mod}_\text{Air State}</math> is the Air State modifier.
** {{color|green|'''AS+'''}}: 25
** {{color|green|'''AS'''}}: 40
** {{color|red|'''AD'''}}: 55
|}

A single roll is performed using the Final Trigger Rate. If successful, Contact advances to Step 2.

===Step 2: Aircraft Selection===

After a successful Step 1, each plane will roll a Selection rate to be allowed to perform contact. The rolls are performed for each plane independently following a set priority, from highest to lowest. The priority for Aircraft Selection is:

* {{Acc}} Accuracy stat, starting from highest.
* The Carrier's position in the fleet, starting from Flagship.
* The Equipment slot position, starting from the first.

{|class="wikitable mw-collapsible mw-collapsed" width="100%"
!Aircraft Selection Formula<ref name="vita"></ref>
|-
|
<math>\text{Selection Rate}= \frac{\text{LoS}_\text{Plane}} {\text{Mod}_\text{Air State}}
</math>

Where:
* <math>\text{Selection Rate}</math> applies only to planes that can perform Contact ({{YellowPlane}}{{BluePlane}}/{{Night Torpedo Bomber}}/{{SPR}}/{{Night Recon}}/{{Large Flying Boat}}).
* <math>\text{LoS}_\text{Plane}</math> is the plane's displayed {{LOS}} LoS stat.
* <math>\text{Mod}_\text{Air State}</math> is the Air State modifier.
** {{color|green|'''AS+'''}}: 14
** {{color|green|'''AS'''}}: 16
** {{color|red|'''AD'''}}: 18
|}

The first Squadron that succeeds to be selected will perform Contact. If all planes fail to be selected, '''Contact will not trigger''', even if Step 1 was successful.

If successful, then Contact will grant an additional damage multiplier based on the selected aircraft's {{Acc}} stat.

{|class="wikitable" style="margin:auto; text-align:center"
!Accuracy {{Acc}}!!Damage Modifier
|-
|0||112%
|-
|1||112%
|-
|2||117%
|-
|3+||120%
|}

<references/>

==Anti-Air Rocket Barrage==
Certain ship types have the ability to trigger an "Anti-Air Rocket Barrage" (AARB), completely negating any airstrike damage.

* The '''only''' ships types able to trigger this mechanic are:
** [[BBV]], [[CV]], [[CVB]], [[CVL]], [[CAV]], and [[AV]].
* The ship must be equipped with a '''{{Equipment/Link|12cm 30-tube Rocket Launcher Kai Ni}}'''.
** It is often referred to as "RLK2" or "Rosa Kai Ni" for short.

{|class="wikitable mw-collapsible mw-collapsed" width="100%"
!AARB Trigger Rate Formula
|-
|
The trigger rate for a given ship is:

<math>\text{AARB %} = 100 \times \frac{\text{AdjAA}_\text{ship} + {0.9} \times \text{Luck}}{400 - \left( 40 \times \text{N}_\text{rocket} + \text{AdjAA}_\text{RLK2} + 30 + \text{Mod}_\text{Ise-class} \right)} </math>

With:
* <math>\text{AdjAA}_\text{ship}</math> the previously calculated '''[[#Adjusted Anti-Air|Adjusted AA]] of the ship'''.
* <math>\text{Luck}</math> the ship's {{Luck}} Luck stat.
* <math>\text{N}_\text{rocket}</math> the number of {{Equipment/Link|12cm 30-tube Rocket Launcher Kai Ni|text=RLK2}} equipped on the ship.
* <math>\text{AdjAA}_\text{RLK2}</math> the '''[[#Adjusted Anti-Air|Adjusted AA]] of the RLK2''', being {{ToolTip|'''48'''|<math>\text{8} \times \text{6}</math>}}. 
* <math>\text{Mod}_\text{Ise-class}</math> being '''70''' if the ship is an {{Class|Ise}}, '''0''' otherwise.
|}
[[File:Anti-Air Rocket Barrage.png|thumb|right|Ise triggers AARB, while Choukai triggers a AA Shell barrage, during the Airstrike Stage.]]

If the AARB triggers on a ship, the ship will slide forward, and '''Rocket Barrage Successful''' (噴進弾幕成功, ''funshindan maku seikō'') will be displayed over its card.
*If the ship does not take any damage during the airstrike, the same animation will also be played, even if the AARB failed to trigger or the ship was not targeted by any bomber.
*Generally when a ship is targeted by any bomber and takes no damage, the text "'''miss'''" will be displayed over the ship's card, but if the AARB actually triggered, nothing will be displayed instead.

;Notes
* It is possible to achieve more than 100% activation rate.
* There is another anti-air barrage animation in-game for only {{GreenAmmo}} [[AA Shell]]s. ''No effects were found for it.''
** The combination of a [[AA Shell]]s and the {{Equipment/Link|12cm 30-tube Rocket Launcher Kai Ni|text=RLK2}} is also supposed to have extra effects. ''No effects were found for it.''
** The uselessness/cosmetic-only role of AA Shells in this mechanic might be an historical reference to the real T3 shells, being extremely ineffective in their AA role, and being compared to simple "fireworks".

=See Also=
{{Mechanics}}