HX Models 1:400 Boeing 747-8F N747EX Flaps down Model1: 400 Diecast: Boeing 747 8F "House Colors" N747EX Flaps Down (HX Models B631004F) N747EX (MSN RC501) is the Boeing 747 8F prototype, the aircraft that carried the entire 747 8 program into the air for the first time. On 8 February 2010 at 12: 39 pm PST, N747EX lifted off from Runway 34L at Paine Field, Everett, Washington, completing a 3 hour 39 minute maiden flight that validated the stretched airframe and new GEnx 2B engines. N747EX remained