Flexible fronts would work as such:
Lets use for an example this map we're in now for TOD Friday. Lets say that the first frame, LW hits A40, and A41 and A42, all of 40,41 is destroyed, flattened target. A42 however is still standing, 90% destroyed.
Now the Allies hit A19, A20 and A21, but only A19 is totally destroyed, A20 and A21 are at 50% and 90% down respectively(not including AA).
A19 (destroyed) and A40 would "trump" each other, as well as A20(partially destroyed) and A42 (Partially destroyed) would also trump each other...but since LW completely destroyed one more field(A41) than the Allies base(21), the Axis "front" moves, they're awarded a new base, a foot hold on the enemy front, A42 is a new LW base.
Basically, tick for tack. If both sides completely destroy 3 fields, then no front moves, but if one country destroys completely 1 additional field more than the other, they're awarded a capture and the front moves.
The benefits are:
No "Repeats" of the same target unless that target is not 100% destroyed, or if it ends even, all targets are restored to 100% capacity.
Different area's of the map to fly and fight over...hitting the same fields in all 3 frames is alittle tedious.
Reward for going above and beyond, and not limited to points, but a flexible front from which the "Generals" can be creative with new tactics.
Food for thought, sounds confusing, but its really not.