This Cargomaster (N199AB, ex-61999) is owned by Cargomaster Corp (Ted Stevens International Airport, AK) and it flies only occasionally. That airplane has never been certified by the Federal Aviation Administration for civilian operation. Thus, it must fly as a government aircraft, mostly for the State of Alaska, where the last known flights were in the summer of 2004. More about this particular aircraft here:
http://www.ruudleeuw.com/c-133_by_sibitzky.htm