Delivered new to Eastern Airlines in 1952 as N452A. Became N442D of Graubart Aviation in 1961. Joined Ray Charles Enterprises in 1966 as N923RC. Re-registered as N9234C in 1967. Subsequent owners included Flamingo Airlines whose basic colours it still carries. Joined Frontier Airways in 1975, one of a number of Martin 404s eventually assembled for aerial crop dressing work. The sadly fatal takeoff crash of N40443 in 1986 at Buffalo, WY led to operations ceasing and the remaining aircraft being put into storage at Sheridan.

Stored for years in Sheridan, Wyoming, Harold Sheppard acquired the airplane, disassembled it and moved it to Greybull.

K25 slide scan. Built 1952 for Eastern. Acquired by Frontier Airways 1975 as an aerial applicator operating out of Sheridan, WY. The operation stopped around 1987 after sister ship N40443 had crashed on take off from Buffalo, WY 27 June 1986 killing the crew and the remaining aircraft where put into storage. Still carries faded Flamingo Airlines colours from 1972. Aircraft was dismantled 2009 with the nose section going to the National Museum of Commercial Aviation at Forest Park, GA while the remains were trucked to Greybull for further storage.

One of two M404s that were long-time residents of the airport. This aircraft was broken up in 2010 or 2011.