The first KC-135A entered the U.S. Air Force fleet in 1957; the last was delivered in 1965. About 550 of the 732 tankers built, all by Boeing at its Seattle facilities, remain in service. In addition, Boeing built 88 similar aircraft for other Air Force uses, such as flying command posts, pure transports, electronic reconnaissance and photo mapping. The last of these special-purpose aircraft was delivered in late 1966
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