This number represents the total damage that aircraft can inflict before it runs out of ammo for all its weapons like missiles and bombs and has to return to the carrier for resupply. This statistics includes AOE damage and average critical damage.
If the aircraft has a squadron size larger than one, the number is multiplied by the number of planes in the squadron.
This is the theoretical maximum and actual damage might be less because of factors like enemy flares, enemy air defence and RNG (randomness) in critical hit and AOE damage.