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CAM-30N3 First Night-Time Flight%u2014%u2014April 1, 1930%u2014%u2014Terre Haute to Chicago, IL.Interstate Airlines, Inc.%u2014%u2014Durward Ledbetter & Joe Hammer, pilots.This was the first night-time flight for northbound CAM-30N3. Addressee, George A. Zimmerman (photo below) began collecting stamps in 1892, was an avid air-mail collector, and was a Director of the American Air Mail Society in 1930.

