It is much for harder for a regional because...
1. Their contracts can normally be cancelled if they enter BK. In times like these, everyone wants to cut capacity and ANY regional would be fired if they filed BK.
2. Nobody gives a crap. Congress is not going to bail out mesa, or any other podunk commuter airline.
Mesaba was different, that was orchestrated by NWA. A wholly-owned that gets sucked into BK has a better chance.