The prototype Boeing 747, City of Everett, N7470, on display at The Museum of Flight, Boeing Field, Seattle Washington. Parked behind it are an American Airlines Boeing 727-223, N874AA, and the prototype Boeing 737-130, N73700, retired from NASA service. The three vertical fins of a Lockheed L-1049G Super Constellation, CF-TGE, are visible in the lower right corner. (Rafal Szczypek)