Well, that would require the development of a whole flight SIM to support it. That's not going to happen, although your idea is excellent.
May I suggest that you look at Battle of Britain 2 - Wings of Victory? They have exactly that model. Unfortunately, I think there's a bug that means that Axis fighters have major problems escorting their bombers, but it's a fun experience nonetheless and worth owning.
Now, my all time favorite in this genre is B17 The Mighty Eighth - the best wargame ever to sit on my PC and I still play it. In fact, I may start it up right now! You need to patch it and mod it, if you can still find it to buy, and the graphics are a little fuzzy but still way better than many games that came out much more recently. If you do buy it, PM me and I'll point you at some links for mods etc.
B17 was a game way ahead of its time - you plan the missions on a map of Europe, review your crews, maintain your aircraft, fly the missions (or jump to enemy planes, OR just spectate) operate as a gunner, navigator, radio op AND bomb aimer. Fantastic game design.
Why nobody can code games that way anymore is a mystery to me...