Worked for FLX for a hot minute some years ago. They flew 210s and Barons (although towards the end the Barons started going away). Then they were purchased by Bayside Capital (which also owns/owned Airnet) so there was a bit of a mini merger.

Haven't thought about them at all for awhile now, but I just googled them and wikipedia says they are still around flying, but the C210s and Barons are gone. Looks like its mostly C208s, Lears, and Navajos now.

There was another company used to do check-hauling as well out of RDU, I believe it was called Ram Air Freight. I never worked there, but met quite a few people that did. I think they flew Piper Lances and Senecas. Last I heard they still operated an Avionics shop, but a google search didn't reveal anything.