I've flown several on Military charters when we don't take our own jets, mainly to Saudi, etc. There are a couple of older topics on here that might have some info also. But ATA is a biggie for AMC charters (as is World, North American, United, Continental etc). I've read here they also still do vacation charters with them.
Ciao, and Hook 'em Horns,
Capt-AWACS, Yankee Air Pirate
Io voglio fica ogni giorni da mia bella moglie!