The Boeing KC-135 Stratotanker was developed as a replacement to the KC-97. The U.S. Air Force needed a jet tanker to be able to refuel its new fleet of B-52 Jet Bombers. Its first flight was in 1956 and entered service in 1957. The KC-135 is similar in appearance to its sibling, the Boeing 707 Airliner, however, it is slightly narrower and shorter than the 707.
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