Regions Air is headquartered in Smyrna, Tennessee (just southeast of Nashville). It was formerly Corporate Airlines, and they recently changed their name to Regions Air. Although that came fairly soon after the crash in Kirksville, I had heard people talking about a name change before that. They currently only fly Jetstreams (19 seat versions) but recently announced that they are going to start flying Saab 340's. The first Saab class is currently in the sim in St. Louis, although they have not yet received the airplanes. Apparently the Saab base will be in Cleveland and will be doing business as Continental Connection.
They have 2 bases: Nashville & St Louis. Nashville is the smaller (and more senior) of the two. All of their flying is EAS (Essential Air Service) contracts.
They have one of the lowest pay scales in the industry, but it is also a quick upgrade (about one year currently). It is also a pretty small company (I believe less than a hundred pilots).
From what people have said that work there, the pay and QOL are difficult to deal with but it's a fast upgrade and most of the people there are great.