Missions are very diverse, and the only thing that limits them is the limited imagination of some people.
Some people will launch the same old 110's and a goon NOE, or 40 hvy P47s to flatten everything. Those people either have no imagination, or just can't bothered to think up a real plan. With the mission planner you can have any number of wings flying any number of planes, following any number of way points, from any number of bases. With a little math you can stagger the launch times so That the plane launch at the right times to have the right amount of time to climb out to different point to meet up with other wings launched from different bases.
There is nothing as neat as climbing out to your way points with a half dozen buff formations to level off and have your fighter cover come sliding in over head. Talk about realism !