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Interstate L-6 "Grasshopper" The Interstate Company entered the aircraft manufacturing field in 1940 with the S-1B "Cadet," a tandem seat liaison airplane. When the United States entered World War II the U.S. Army Air Forces (AAF) contracted with Interstate for 250 S-1B aircraft, designating the prototype as the XO-63. It was the last airplane to use the "O" as the observation designation. Later, the AAF designated the production airplane as the L-6. The aircraft, however, had significant overheating problems that were only partially solved. It had the dubious distinction that fewer L-6s were built than any other AAF liaison aircraft. The AAF used the L-6 as a utility transport, liaison, and training aircraft in the United States, but never shipped it overseas. After the war the remaining L-6s were sold as surplus.. | ||||||||||||||||||
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