Originally built for the US Army in 1976 as 73-22264. To the LAPD in March 1997, to N254AG, N48A, becoming N990SH in 2016.

Built as a civil aircraft and registered NC8943H, it was one of 83 of the type bought from North American by the USAAF for use as liaison and staff transport aircraft and designated L-17A, and in this case allotted the serial 47-1312. It was later fitted with new brakes and fuel tanks by Schweizer Aircraft Corporation and re designated L-17C. Later civilianised as N6724C it had a number of accidents, and was most recently restored by lately deceased Milwaukee Police Sgt. Burton K Ottow whose name it still wears. It was being offered for sale at Oshkosh with the proceeds going to his estate.

Del 02 Dec 2011 Test Registration as F-WWBG "TACA Heritage Colors"

Small Avincis titles on the rudder

On display amongst some other US Army helicopter types at this super museum.

In 1953 the US Army awarded a contract to Sikorsky for the experimental conversion of 3 H-18 (S-52) helicopters from piston to turbine power. Of the three aircraft, two were designated XH-39s by the Army (49-2890 was used for testing and 49-2891 was a static test frame that never flew). The XH-39 was in competition with the Bell XH-40. The Army chose the XH-40, which became the UH-1 Huey. This is the third H-18 converted, designated S-59 by Sikorsky, and was used by the company demonstration and publicity flights, for example static display at the World's Fair in New York in 1964.

This LZ-1A was built initially as a Sikorsky R-6 and TOC with the USAAF as 43-45480. The frame was selected for testing with the new Doman rotor-hub system. The blades are held on the hub similar to a variable-pitch airscrew blades and the rotor incorporates a gimbal mounting to provide the necessary tilting of the rotor disc. The flight tests were started in early 1950 with remarkably good results and so the larger LZ-2A Pelican followed. The LZ-1a is now on display at this super museum.

This Electra was constructed as a XR20-1 in 1938 and TOC with the USN with BuNo 0267. The plane was based at NAS Anacostia for use as a staff transport by the Secretary of the Navy. Post-WWII it flew as N57573 and came to the NEAM in August 2010 where it has been wondefully restored in this Northwest Airlines scheme.