Changes

for index, ship in ipairs(ships) do

for index, ship in ipairs(ships) do

if not ships_to_skip[ship] then

if not ships_to_skip[ship] then

local remodel_to = ship_data[ship]:remodel_to()

local remodel_from = ship_data[ship]:remodel_from()

if ship_data[remodel_to] then

if ship_data[remodel_from] then

local identical = true

local identical = true

for day, possible in pairs(availability[ship]) do

for day, possible in pairs(availability[ship]) do

if availability[remodel_to][day] ~= possible then

if availability[remodel_from][day] ~= possible then

identical = false

identical = false

end

end