I picked up this shirt a few days ago. It is quite an interesting shirt from a now defunct airline called Southern Air Transport. Seems as if SAT was a front company for the Central Intelligence Agency. This airline did a lot of work in Central America (Honduras, El Salvador, and Nicaragua) and in Africa (Angola). These types of shirts don't come up for sale very often. If you want to read some more about SAT.....here are some links to check out:
http://en.wikipedia.org/wiki/Southern_Air_Transport
http://www.air-america.net/sat-post.htm