For the Discussion Wotan/Kweassa were having. Two options I've heard about are If you're not an effective mission participant (one that runs or isn't a team player)
1) One option discussed described, that people accepted you to join the mission not everyone was free to join any mission, So the designated flight lead would choose who he would like around him. If you get a bad reputation you might be stuck with bad tasks, ie. Bomber gunner.
2) Or you had a minimum point value to join a mission for designated planes/roles i.e. only need 100 to fly a bomber, and 1200 to fly a fighter etc..
Missions are plotted together, meaning missions are planned by the avatars so they would intercept and make the experience enjoyable. If not it would be no fun to fly 2 hour missions with out encountering an enemy. So thus since missions are known by the avatars they can assign a "Difficulty" multiplier to a mission, a strike into berlin would have a higher difficulty rating than a bomb run in Southern Italy. If you die on a more "difficult" mission you might lose less points, but gain more if you succeed.
-BlckMgk