I always fly alone, or I should say, without a wingman or another to fly with me. I haven't joined a mission in many years. Why? Invariably, most missions are badly thought out. Moreover, there are too many helpless player that join the missions, guys who cannot possibly defend themselves, much less support anyone else. Likewise, I don't need a guy with a fractional K/D ratio telling me how to fly. I will assist a mission if I happen to be there, but I will not participate as part of the mission.
Besides, I prefer to fly mid-war fighters, which are never selected for missions, nor do they carry the ordnance they want. Indeed, if in a P-39Q for example, the Mustang mission will be miles ahead of me in short order.