Just completed the game for the 4th time with Shadow and you get.....
Nothing. No new title screen or anything. Oh, well.
Did it with Sol & Rey, and the pic at the end of the credits has all 10 pilots on it. Cool.
Gonna do it with one of the comedy planes next, to see if the end sequence changes or anything. Will use the DC pad.
EDIT: :smt033 Just completed it with the HKT-7700 (DC pad). Quite funny end sequence, seeing the DC pad flying over the various levels. Looks like a UFO! The best part is, when you get shot down, the VMU parachutes to safety. :smt043
What I have noticed though, is that an icon for each character appears on the top of the title screen when you complete the game with that character. There is definately only space for 13 icons, so no more secret planes then. Maybe get a new title screen when finishing the game at least once with each character?