Probably LabQuest, aka Quest Diagnostics, Part 91. Last I knew they had a base in gwinnett co, ga (sp?) outside atlanta and their main base was RDG. They fly their company specimens around. They had a large fleet of TBM 700's and 1 PC-12, and were trading their 310's for BE-58's. I think they started buying A36's as well.
I think they've opened up a small base in Tampa too. I've been out of the loop for a long time.
I tried for a few years to get in there. No dice...more pay than you can EVER imagine flying in small single pilot planes...
~wheelsup