I did some testing with a 3x3Refinery foundation, and putting the DockingOffset in the blank cell. The plane refused to land after paradropping troops. Testing passengers boarding aircraft docked on a building now.
Edit: Tested. The infantry move onto the building until they're right underneath the aircraft, but refuse to enter it.
Edit: Tested. The infantry move onto the building until they're right underneath the aircraft, but refuse to enter it.