Its a What ?? - it was called back in its day a "Martin 404".                                                                        First deliveries in 1951 were made to Eastern Air Lines (EAL) who had ordered 60 and Trans World Airlines (TWA) who had ordered 40. The only other new aircraft from the production line were delivered to the United States Coast Guard who had ordered two as executive transports with the designation RM-1G later changed to RM-1 and then in 1962 to VC-3A. In 1969 they were transferred to the United States Navy and they had both been withdrawn from use by 1970. A total of 103 aircraft was built at the Glenn L. Martin factory in Baltimore.

TWA operated their 40 4-0-4s under the name "Skyliner" on scheduled services in the eastern part of the USA between 1 September 1950 and the last flight on 29 April 1961.[1]. EAL operated their 4-0-4s in the eastern USA using the class name "Silver Falcon". The first EAL schedule was flown on 5 January 1952 and retirement came in late 1962.[2]

Later in their airline career, as they became displaced from the EAL and TWA fleets by turbine-powered aircraft, the 4-0-4s became popular with "second level" operators who needed to replace their Douglas DC-3s.[3] One of the last 'major' US airlines with a large fleet of piston engined airliners was Southern Airways who operated 25 model 4-0-4s on a network of scheduled services from Atlanta in July 1969, mainly ex-Eastern Airlines aircraft.[4]. Southern Airways' last 4-0-4 service was flown on 30 April 1978.[5]

In February 2008 the last airworthy 4-0-4, an ex TWA aircraft, was ferried to the Planes of Fame Museum in Valle, AZ. [6]

A restored and potentially airworthy 4-0-4 is at the Airline History Museum in Kansas City.

Wow...wonderful shots...well done...

First Two shots are impressive.

have to back to work now. wish i was simming right now.

Several Martin 4-0-4s met their demise at an airport near my hometown.  The story behind them is that they had been confiscated among other items by US Customs many years before, and left to rot.  After 10-20 years of being left derelict, the airport finally got permission to have them cut up and removed from the airport.

Actually did a little search and turned up some info on the Martins that were formerly located at Stennis International Airport.  http://www.ruudleeuw.com/deepsouth.htm