 On September 10, 1962, a U.S. Air Force KC-135 Stratotanker was descending for a landing at Fairchild Air Force Base west of Spokane when it flew into a fog-shrouded ravine on Mount Kit Carson.The aircraft was based at Ellsworth AFB in South Dakota and all forty-four aboard were killed.It was the worst aviation accident in U.S. history (at the time) and as of October 2012, remains the 3rd worst accident (currently) involving a KC-135.