N37581 Douglas DC-6B United Airlines (UA / UAL) Waterloo - Regional Airport (ALO / KALO), USA - Iowa Dave Welch Collection - 01/01/1960
N37581 Douglas DC-6B United Airlines (UA / UAL) Unknown, USA Dave Welch - 1961
N37581 Cessna O-2A Super Skymaster Pima Air & Space Museum Tucson - Pima Air and Space Museum, USA - Arizona Rico Swytech - 21/05/2004
N37581 Cessna O-2A Super Skymaster Pima Air & Space Museum Tucson - Pima Air and Space Museum, USA - Arizona Jon Wickenden - 27/01/2002
