1946. Greyhound tests its helicopter transport in Detroit

 

Three passengers transfer from a bus to a Sikorsky S-51 helicopter during an experiment recently conducted in Detroit by Greyhound Lines to determine practicability of this type of service. It's stated that Greyhound plans nation-wide integrated bus-'copter service to go into effect as soon as equipment can be purchased. (Acme photo) 

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Aviation Week | July 8, 1946