When I did some contract work for Pfizer a couple of years back they were flying the two 135's and I think they picked up a couple more corporate jets when they acquired Pharmacia.. I wanna say Challengers but I'm not sure about that. Pfizer operats their ERJ's as shuttles though, not corporate planes. They have standard passenger seating and they fly loops between Kalamazoo, Morristown, and St. Louis, for employees commuting between offices. They have a couple other jets that they fly as corporate planes for execs. Pretty sure it is a completely internal flight department, but not sure who the contact would be.
cale