'On May 24, 1946, the CAA publicly demonstrated the world's first radar-equipped control tower for civilian flying at the Indianapolis airport.' Retired to the Smithsonian museum in 1953, this Boeing 247 had taken part in the London - Melbourne race in 1934 as NR257Y. Photo from: Federal Aviation Administration

The Boeing 247 at the start of the London - Melbourne race. The text below the aircraft name reads 'Col. Roscoe Turner - Aviation Adviser to Warner Bros. Studios'. Race number is 5, while 57 refers to Heinz's 57 ketchup varieties. The flamboyant 'Colonel' Turner's fantasy uniform 'afforded considerable amusement' among the British public. The co-pilot was Clyde Pangborn - see photo 488490. Photo from: Nationaal Archief (Netherlands)

Last official registration was N11 with the FAA

Famous racing pilot 'Colonel' Roscoe Turner borrowed the first Boeing 247D from United Airlines for his participation in the MacRobertson Air Race. It is seen here over the USA already wearing race number 5. The number 57, referring to Heinz's 57 ketchup varieties, and the name Warner Bros. Comet were added to please Turner's sponsors. Photo from: San Diego Air & Space Museum