There should be a AC-130 Gunships or A-10 Warthogs in the game, as an elite unit. The premise behind them is that they would be able to attack without having to refuel, kind of like how anti air can attack every few minutes by reloading. They would be considered low flying aircraft and the only anti air that would be able to counter them and upgraded versions would be able to have a slight defense against air threats, like the elite chopper. They would require a lvl 3 air base at lower levels and lvl 5 at max lvls. It would be cool to see planes like these that are used often in modern combat get used in the game and should be included.