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CIRCA 1938: A view of the water landing of a Pan Am Bermuda Clipper, a Boeing 314 Flying boat which flew between Baltimore Maryland and Bermuda. Later renamed, Hong Kong Clipper and sank by the Japanese in Hong Kong harbor on December 8,1941. (Photo by Ivan Dmitri/Michael Ochs Archives/Getty Images) )

CIRCA 1938: A view of the water landing of a  Pan Am Bermuda Clipper, a Boeing 314 Flying boat which flew between Baltimore Maryland and Bermuda. Later renamed, Hong Kong Clipper and sank by the Japanese in Hong Kong harbor on December 8,1941. (Photo by Ivan Dmitri/Michael Ochs Archives/Getty Images) )

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UNSPECIFIED - SEPTEMBER 17: People boarding Boeing 314 Clipper 1939 NC18602 (Photo by Apic/Getty Images)

UNSPECIFIED - SEPTEMBER 17:  People boarding Boeing 314 Clipper 1939 NC18602  (Photo by Apic/Getty Images)

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A view from the Boeing 314 Pan Am Bermuda Clipper. The flying boat was used on the Baltimore to Bermuda route in 1938. Renamed the Hong Kong Clipper II in 1941, it was sunk in Hong Kong Harbor on December 8, 1941 (Photo by Ivan Dmitri/Michael Ochs Archives/Getty Images)

A view from the Boeing 314 Pan Am Bermuda Clipper. The flying boat was used on the Baltimore to Bermuda route in 1938. Renamed the Hong Kong Clipper II in 1941, it was sunk in Hong Kong Harbor on December 8, 1941 (Photo by Ivan Dmitri/Michael Ochs Archives/Getty Images)

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UNSPECIFIED : On april 25, 1939 : christening of plane California Clipper (Boeing 314, seaplane) of Pan American Airways (Pan Am) in Treasure Island, photo by Art Green (Photo by Apic/Getty Images)

UNSPECIFIED :  On april 25, 1939 : christening of plane California Clipper (Boeing 314, seaplane) of Pan American Airways (Pan Am) in Treasure Island, photo by Art Green  (Photo by Apic/Getty Images)

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At the seaplane base at LaGuardia Field, people watch as the Pan American Airlines' Boeing 314 Clipper 'Dixie Clipper' (background) taxis away (en-route to Portugal), New York, New York, April 30, 1941. In the foreground is another Clipper, due to be turned over to the British government for use in the war effort. (Photo by Office of War Information/PhotoQuest/Getty Images)

At the seaplane base at LaGuardia Field, people watch as the Pan American Airlines' Boeing 314 Clipper 'Dixie Clipper' (background) taxis away (en-route to Portugal), New York, New York, April 30, 1941. In the foreground is another Clipper, due to be turned over to the British government for use in the war effort. (Photo by Office of War Information/PhotoQuest/Getty Images)