Ifly,
How is working at Airnet? As far as check haulers go, they seem to keep their equipment in good shape, and most of the pilots I've talked to say they are a good company.
ATP, I had a Jetride lear come into the FBO a couple weeks ago. The crew was pretty nice, both had good things to say. It sounds like they tend to upgrade people from the freight side to people flying however these guys were the exception. Both were hired from other charter ops.