>>527593775
The Starling and Seabreeze and is probably what I'd call fun to simply fly of the ones I have.
LF-22 Starling being a fighter based on that old nazi germany design which I believe is most known for dousing several of it's pilots in fuel that they were completely unable to put out. It sports jet boost take off, and just jet boost in general. It's comically slow without it and crazy fast with it, it recharges slowly in the air, and quickly if you land. Landing might be tricky though since it's essentially a jet motorbike.
The Seabreeze is also a lighter plane, but sports two seats, can land on water and takes off and lands pretty easily, even from water. Only front gun and bombs though.
I do want to mention the Tula too, which might be the most multifunctional vehicle in the game, seating up to 5 players, has jet booster take off, is a vtol propeller plane, has aquatic landing, bombs, a strong pilot gun and a rear turret. Only thing it doesn't have is missiles. It's my go to for doing missions with some friends, great for dropping them down at places and doing pick ups in tighter spots.