According to Internet Movie Database.....
"[Travolta] Pilots a multitude of jet aircraft. Most notable aviation feat is successful landing at Washington National of a Gulfstream IIB with complete electrical failure. Conditions at the time were night, IMC, icing. December of 1993."
No mean feat - if true, IMHO
I expect all the 747 stuff is Movie Industry bullsh*t. Surprised they haven't had him doing weekend work flying Stealths/Blackbirds even UAVs!