I think supply or dynamic ENY might make a difference. (the more popular the plane is the lower it's eny becomes and vice versa for planes nobody is flying)
I still remember back when I used to play WWII online people yelling. "Stop spawning tanks! There's a guy with a bazooka in the vehicle spawn!" Everybody would scramble to kill that guy. WWII online was fun until the numbers went away. Graphics in that game are really dated and the cheating got to the point that somebody posted an ESP hack video on youtube. Instead of addressing the cheating the "rats" got the guy to put a password on the video. Guess they could deny there was any cheating going on if they hid the evidence. lolz