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CAM-30, Schedule Change%u2014%u2014September 25, 1929%u2014%u2014Evansville to St. Petersburg FL. Interstate Airlines, Inc.According to The Postal Bulletin #15101, on September 25, 1929 the schedule on CAM Route 30 between Chicago and Chattanooga was changed. This cover was rubber-stamped %u201cHOLD FOR C.A.M. 30%u201d and mailed on that date, from the CAM Contractor, Interstate Airlines, Inc., to the Aviation Editor at the St. Petersburg Times. According to a penciled notation, it was %u201c...probably (a) publicity release for newspapers.%u201d Interestingly, it is rubberstamped %u201cNORTHBOUND,%u201d yet was mailed to a city in the south. No Backstamp.