What airline?

If US/AA, found a five segment for $339 same day return 8/23 ATL-CLT-DFW-GCK-DFW-ATL. Depart 550am arrive back in ATL at 915pm. Also can get six segments for $432 with stop in CLT on the way back. You can find this on the AA website.

American Airlines 658
Operated by US Airways
Atlanta (ATL)
August 23, 2014 05:50 AM
Travel Time : 1 h 6 m
Cabin Class : Economy
Charlotte (CLT)
August 23, 2014 06:56 AM
Booking Code : N
Plane Type : 321

American Airlines 1479
Charlotte (CLT)
August 23, 2014 08:40 AM
Travel Time : 2 h 45 m
Cabin Class : Economy
Dallas/ Fort Worth (DFW)
August 23, 2014 10:25 AM
Booking Code : N
Plane Type : 319

American Airlines 2533
Operated by ExpressJet as American Eagle
Dallas/ Fort Worth (DFW)
August 23, 2014 12:30 PM
Travel Time : 1 h 20 m
Cabin Class : Economy
Garden City (GCK)
August 23, 2014 01:50 PM
Booking Code : N
Plane Type : CRJ

American Airlines 2533
Operated by ExpressJet as American Eagle
Garden City (GCK)
August 23, 2014 02:15 PM
Travel Time : 1 h 20 m
Cabin Class : Economy
Dallas/ Fort Worth (DFW)
August 23, 2014 03:35 PM
Booking Code : N
Plane Type : CRJ

American Airlines 1298
Dallas/ Fort Worth (DFW)
August 23, 2014 06:15 PM
Travel Time : 2 h 0 m
Cabin Class : Economy
Atlanta (ATL)
August 23, 2014 09:15 PM