BrownDeerAggie said:
If you really want to be technical it is American Eagle operated by SkyWest. It is an American subcontractor, but American is still only option. You can only book through AA.
Does Envoy Air still fly in and out of CLL? When I was traveling a lot for work, it was 50/50 Envoy and SkyWest for my American Eagle flight to DFW.