In the current mission (which is essentially just brawling) players only have the F-5 and Mirage F1 as available rides atm and Boroda's cousins get the MiG-19 and MiG-21. Currently all aircraft are limited to a pair of IR missiles and a centerline fuel tank(?) I think. (I apologize for getting it wrong the first time.)
Start your plane, takeoff and head to an enemy base. If you kill the defenders that spawn, more will spawn, up to two times. The 4 aircraft types for each side that I mentioned earlier can spawn 1, 2 or 3 at a time. Once a random flight is chosen that same flight will respawn up to twice more if the first flight dies.
That process can be reset by leaving a rather large trigger zone and then returning to the enemy base.