Original sentence: One of two Boeing VC-25 aircraft, which are extensively modified versions of Boeing 747-200B airliners, serve as long distance travel for the President, and are referred to as Air Force One while the president is on board
Edited sentence: One of two identical Boeing VC-25 aircraft, which are extensively modified versions of Boeing 747-200B airliners, serve as long distance travel for the President, and are referred to as Air Force One while the president is on board