I tested sniperton mission as well and obtained the same results as he described above, but I could see some problems with this approach when using it in a dogfight or any other type of online mission with a lot of players in it. First, the system would require the players to be rather fast to turn on and begin taxing otherwise the next generated AI group would cause destruction of the planes if one unfortunate player took too long to move out of the way. The other problem is actually related to the AI per se. In a campaign for example, the AI usually fly in a group of 8 aircrafts to complete the same objective. The spawning feature, however, only allows 4 aircraft to be created at a time which means that the first 4 aircrafts of the group would have a 8 hour advantage over the second created group of the remaining 4 aircraft. Consequently, they would not be flying in formation but rather two separate groups with a 3 min difference between them. Unless the first group has a patrol type of waypoint so it can circle around a couple of times so the second group may regroup to the leaders flight, I dont see any way to overcome this issue with your suggested system ...
It is a good idea though but it would require some tweaking of DCG engine.