Available upgrades are
Countermeasures - chaff, flare, and different smoke colors
Handling - smooth, sport, , race
Weapons - bombs , 7.62 mg or explosive cannons, homing missiles. You can control all 3 plus flares without a passenger.
And it's a two seater! (when is the last time you took a friend along for a dog fight?) . One of my favorites in the update .