Most of the nation's private, local banks have stated that they won't be able to impliment the required changes in the time the fed had originially stated. Therefore, the check21 legislation has been changed multiple times to allow the result is that while being reduced, there will still be some flying around for this purpose for quite a while.
AirNet, and others have also diversified and are doing a pretty good job finding new contracts. UPS, and Fed Ex are always changing feeder contracts and I know quite a few have changed hands recently. If you're looking for an hour-building job this option should be around for a few years. The big problem, however, is that they're switching from barons to caravans so your multi time just went "poof".