[V12 - Aircrafts] Fuel recovery not same for the same 2 F17

I send two aircrafts for a intercept f17 -1 and f17 -2. they go back to base and another ufo appears right after they land on base. when you intercept the coming ufo one fighter has less fuel than other. In my example one had F17 - 2 had 47% and other F17 - 1 had 100% fuel. Do they refill one at a time?

Were they damaged? I think refuelling happens after repairs.

well now that you say im not sure... it was an attack on a small scout. normally he doesnt make damage i think! sometimes he just fires a missile maybe...

Yeah, those are armed, and sometimes they'll damage one of your aircraft. I think the damaged aircraft possibility is a pretty likely explanation for this one.