This is the oldest surviving Lockheed Twin airliner. Delivered to Northwest Airlines as N14260 in December 1934. Served USAAF as UC-36A 42-56638 in WW2. In 1970 owned by the Air Museum at Ontario and by the mid 1980s preserved at the Pima Museum.
This photo was added on 17 September 2017, and has since been viewed 53 times.