The RY-3 was a transport version of the PB4Y Privateer. Like the earlier C-87 / RY-2 Liberator Express, it had surprisingly serious problems and most of the 34 RY-3s built were disposed of to the Royal Air Force, receiving the Liberator C.IX designation but seeing only brief service from February 1945 until April 1946. This airframe, BuNo 90021 which became the RAF's JT973, was transferred to the RCAF as an ice research aircraft named Rockcliffe Ice Wagon, escaping the wrecker until 1949. Photo from: US Navy