One more thing.

StartAtMaxSpeed = No

DropOffset = X:100 Y:100 Z:60

For the second plane. You might have already figured this out, the maxspeed will have the plane start a little after the first, not on top of each other, and that is my dropset for the hummers, so they don't land on top of my infantry and look stupid. The hummers will land right to the side of the infantry.