The Convair B-24 Liberator was a heavy bomber powered

The Convair B-24 Liberator was a heavy bomber powered by four Pratt and Whitney 1,200 horsepower engines. It had a gross weight of 65,000 pounds, a 10-man crew, and a top speed of 300 mph. In addition to being used as a bomber, B-24s also served a variety of other functions, including an experimental air refueling tanker and cargo airlifter. In September 1941, two modified B-24 Liberators carried U.S. diplomat to Russia and helped define new air transport routes for global airlift. Those same routes were crucial in wartime ferrying of supplies for World War II following the attacks on Pearl Harbor, Hawaii, on Dec. 7, 1941. (U.S. Air Force Photo)