Built to an urgent requirement for an anti-submarine warfare helicopter, the Bell 61, US Navy designation HSL, was a failure that never went into operational service although 53 airframes were completed. The photo shows the first prototype on its maiden flight, which took place at then Amon Carter Field. That site opened for passengers as the short-lived Greater Southwest International Airport one month later. Photo from: Bell

This photo was added on 10 August 2021, and has since been viewed 648 times.