'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
This photo was added on 8 January 2022, and has since been viewed 396 times.