Owens Corning has three or four Citation Sovereigns. I haven't talked to any of the guys, but from what I gather it's really hard to get a pilot job there.

They are based in TOL like you mentioned...the tail numbers are N2425, N2426, N2428 if you want to look to see what kind of routes are being flown. I heard a rumor that they're getting one more Sovereign, but don't quote me on that.

Owens-Illinois is another flight department based at TOL, they have a G4 and a Sovereign.