Tony Hawk never landed the 900. It was all part of a FBI/underworld-organization conspiracy that started over 50 years ago, with the UFO landings of Roswell. They were trying to create human/alien hybrid slaves for a conquering alien race in a last ditch effort to save their own skins. Tony's own sister was abducted during the night, which sparked his life-long crusade to land the 900.
Andy Mac is also involved, his yellow helmet was installed during vaccination tests.