It is the 737 of the CIA rendition program. It tends to land in the most peculiar places on earth. N313P was one of 26 airplanes (plus 25 additional airplanes which they rented), however it was their largest airplane and able to transport entire teams and delegations from one place to another.
Just like the rogue CIA of the Safari Club, the plane does not seem to directly related to the CIA but is registered to a lawyer and the Paul Laxalt Group which was the former U.S. Senator (R) during the Reagan administration (
http://www.sfbg.com/40/11/cover_plane.html )
According to the official EU investigation into CIA rendition the planes were always rented to one customer called Aero Contractors, Ltd which was operated Jim "Peg Leg" Rhyne, who was one of the chief pilots of Air America, the CIA's airline of the Vietnam era (
http://durhamspark.blogspot.com/2006/02/spotlighting-no... ) which is exactly what the Safari Club was all about as well. It consisted of former senior intelligence officer.
Five planes visited Desert Rock which is an airstrip in the middle of nowhere in Nevada around the same time. The only thing which is near Desert Rock is Camp Atom which is a former nuclear test site. Also the planes visit many places which seemed to have a nuclear connection around the same. And then their main 737 left for Pakistan. (See above)
This kind of evidence is certainly not direct, however it is an indication that the Safari Club network may still be in existance and used by the A.Q. Khan network for nuclear proliferation. The Safari Club was exposed by Ayatollah in 1981 when he let an Egyptian reporter look into the archives of the Shah of Iran, and official the network was closed in 1981 by Jacques Chirac who was mayor of Paris at the time.