What I mean is that the aircraft never despawns like ground units.
The proper software term is persistance.
Aircraft should be persistant in the campaign world.
Each aircraft if received battle damage would be in maintenence needs day before you can ride again depending on damage.
More minutes on older frames increases likelyhood of random failures.
This would make flying in Campaigns even more immersive and fun. Right now losing a plane almost has no consequences landing like a fool or rolling around in grass no consequences.
If you have your settings on realistic there should be consequence and reward for flying accurate. Even small bonuses for proper use of taxiways and ATC. ETC…
Small things like that slowly added on to the campaign would really put it in the next tier of fun for campaigns.