For clarification (OP or others correct me if I'm wrong) he is in the plane that is usually designated as AF1. Air Force 1 is the term for whatever airplane the President is in, no matter what the actual fuselage is. The current plane that Trump is in looks like AF1 and would normally be called AF1, except the "President" is not in it. Because Trump is no longer the President.
For clarification (OP or others correct me if I'm wrong) he is in the plane that is usually designated as AF1. Air Force 1 is the term for whatever airplane the President is in, no matter what the actual fuselage is. The current plane that Trump is in looks like AF1 and would normally be called AF1, except the "President" is not in it. Because Trump is no longer the President.