this is AF1, the other is AF2

and who flies AF2 ? wikipedia says:

Air Force Two is the air traffic control call sign held by any United States Air Force aircraft carrying the U.S. vice president, but not the president.[1][2] The term is often associated with the Boeing C-32, a modified 757 which is most commonly used as the vice president's transport. Other 89th Airlift Wing aircraft, such as the Boeing C-40 Clipper, C-20B, C-37A, and C-37B have served in this role as well.[3] The VC-25A, the aircraft most often used by the president as Air Force One, has also been used by the vice presi