[DoughtyOne]

I believe it requires a single vehicle. There's an internet site. Check it out by using Google to find it.

[RightWhale]

I believe it requires a single vehicle.

I believe so, too. They shouldn't do that, limit the approaches to space travel that way. If the contestants could airlaunch, the contest would already be over, probably a year ago. The objective is to get into space, not to build another rocket.