It used to be called IBA (International Business Aircraft). When I was there, we had something like 30 MU-2's flying 135 freight, checks, mail and AOG parts for Delta, American and Southwest. The owner died about 2 years ago and the place was sold and is no called Air First. However, they only have a few MU-2's and are located on the other side of the field from where IBA was.
IBA used to have a SIC program, but this new company does not. You must have mucho MU-2 hours to get hired to meet the insurance requirments.