I take it you’re referring to Big Bird. We’re talking about the Alcatraz turntable.
Alcatraz’s turntable is part of the queue and doesn’t interface with the trackless ride vehicles, as far as we can tell. See Old Mouseketeer’s post above, or Martin Smith’s posts in the Florida thread. As far as we can speculate, guests will approach the rebel transport ship outdoors on Batuu. The ship conceals the entrance to the turntable. Once on board the “ship,” guests will feel like they’re flying into space and being picked up by a Star Destroyer. In reality, their cabin will have been rotated to face the inside of the attraction building. The door will open and guests will spill out into the Star Destroyer hangar, which is still part of the queue, according to our insiders. The load area is either in the hangar or beyond it, but not before it.