List of US Carriers effective 1/1/16:

Mainline Passenger Carriers:

Alaska Airlines

Allegiant Air

American Airlines

Delta Airlines

Frontier Airlines

Hawaiian Airlines

Jet Blue

Southwest Airlines

Spirit Airlines

United Airlines

Virgin America

Regional Airlines:

Envoy Air (subsidiary of American Airlines Group)

ExpressJet (subsidiary of Sky West, Inc.)

SkyWest Airlines (subsidiary of Sky West, Inc.)