During WW1 two types of conduct were seen as dishonourable or "ungentlemanlike" among airmen: shooting at downed pilots on the ground, and later, when parachutes became common: to shoot at people who had jumped from a burning plane.
Of course this is "just a game", and should perhaps not be taken too seriously, - but you see over and over again that people do in fact do just that:
They greet one another over the battlefield, and congratulate their enemies with a well performed manouver and a successful shot.
Isn't this is a bit different from what you see in your average shoot-em-up? Could it
be the WW1 biplane chivalry reborn?
Noone gets killed for real in a game like this, and noone feels the terror of hanging from a parachute while people on the ground aim at you with rifles, and enemy airplanes point machine guns at you.
In fact, a game is not just a game, - it is part of life, and I still think there should be no reward for killing parachutists.