If you really want to talk about unrealistic let's talk:
- Lack of use of parachutes in WWI ~ only in last 6 weeks were they used
- Pilots landing and then a magical tank appears
This is a game, it's meant to be fun not historically accurate.
Yes there are rules to the game, some Zup said are rules, and then some are generally in place by the players.
I like something Zup once said (I know McFate can find the exact quote), he said that what's not allowed is anything that would make the game not fun for anyone else. Thus spawn killing, etc.
Technically, yes you can drop to "dog fight" in any mission but really if you want to dogfight there are missions that are designed for that, e.g dogfight, capture the carrier, and capture the flag. The only reason to drop in a bombing mission is to get an advantage over those carrying a bomb.