The 747-500X and -600X, proposed at the 1996 Farnborough Airshow, would have stretched the 747 and used a 777-derived wing, but it did not attract enough interest to enter development.
O 747-500X e -600X, propostos no Farnborough Airshow de 1996, estirarían o 747 e usarían unha á derivada do 777, pero non levantou demasiado interese para comezar o seu desenvolvemento.