Here is another issue, when 1 team gets Air superiority, the fighters can easily destroy incoming AI operated requested Air assets using it's SARH Missiles staying outside of other team's AA ranges. (so after 1 team gets only own fighters up, there is no way to fight in the Air)
Solution could be maybe random position temporal Air carriers spawning and teleporting player (that requested the plane) to it or maybe mentioned earlier addition of unused AA assets.