That sounds like a good guess to me. I assume the press press does not pass through customs if they are flying on Air Force One. Does anyone know if Gregory was traveling with the President or on a separate plane?
We in the general public can't learn this info unless we have a tipster inside the WH travel office. But the way it works is a small pool of representative reporters always goes on AF1. The pool is usually the wire services and selected reporters from print and broadcast media. The rest of the WH press corps flies on a separate plane. It leaves and arrives before AF1 so the reporters can be on the ground to cover the President's arrival.