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 [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)

Hulton Archive Apic