The S-39 is an American light amphibious aircraft produced by Sikorsky during the early 1930s. This particular aircraft made its first flight in July 1930 and is the oldest surviving Sikorsky-built aircraft. During WWII it was flown by the Civil Air Patrol from Rehoboth, DE on U-boat reconnaisance sorties and occasional SAR flights. After the war it became a bush plane in Alaska but was abandoned after a crash landing in 1957. Fortunately, the hulk was retrieved in 1963 and brought to NEAM, where restoration in its original CAP scheme was completed in November 1996.

1930-built single-engine 4/5 seat amphibian with single fin carried on twin boom tail assembly.