Aeronautica Imperialis is actually pretty good. More or less same mechanics as the Wings of Glory WW1 or Wings of War WW2 rules.
I had some mods made for Air War C21 for the Supersylph Yukikaze setting: TMP link
What's Yukikaze? It's a series set some point in the future where aliens have made contact with the Earth via a hyperspace tunnel found on Antarctica. Earth aircraft are firmly 5th generation, maybe 6th. The "Fairy Air Force" planes are more like 8th or 9th generation. The multifunction radar on one of the recon birds is powerful enough to cause interference with an aircraft carrier's air-search radar.
This particular bird is named "Yukikaze", but she's representative of the "Super Sylph" recon birds:
According to the books, that beast has a max takeoff weight of 83klbs, but has a takeoff thrust of 100klbs.
This is the frontline combat bird, it's called a Sylphid:
And this is the experimental hot-rod that was supposed to replace Yukikaze:
Very badass, it's even more overpowered than the Super Sylph, and the Super Sylphs can pull 16 gees in a turn.
This is the Earthside JMSDF's frontline fighter, the F/A-27C:
Sadly, no models of the alien fighters.