Just a minor point. Air Force One is the designation used when the US President is flying aboard a USAF aircraft like the VC-25. It the President were to fly aboard a USMC MV-22, the aircraft designation would be Marine One.
The aircraft used to transport the US President are military aircraft, and not leased civilian aircraft. So describing this leased A340-500 commercial jet as "Italy's Air Force One" is not really correct.