The Chance Vought F4U Corsair is THE plane. I'm also kinda partial to the McDonnell-Douglas F/A-18 Hornet. Oh, yeah - the McDonnell-Douglas F-4 Phantom II, and the McDonnell-Douglas-Boeing-Hawker-British AeroSpace-etc. AV-8 Harrier. The F-15 is also one of my favorites. Hmmmmmm - the F-86, the F-100, S-3 Viking, EA-6B Prowler, definitely the C-130, uhhhhhmmmmm, oh yeah, the P-51, the P-47, the P-38, the F7F TigerCat......aw, shoot, I've got too many favorites.
It's hard to really choose just one. BUT, to choose one, it would have to be the Corsair.