Inauguration of helicopter airmail operations in the Chicago area this month permits 10-minute service between the airport and the downtown Post Office roof. A UAL DC-6 is shown ready to receive mail from a Helicopter Air Service, Inc., Bell 47-D1.
Inauguration of helicopter airmail operations in the Chicago area this month permits 10-minute service between the airport and the downtown Post Office roof. A UAL DC-6 is shown ready to receive mail from a Helicopter Air Service, Inc., Bell 47-D1.
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