Southwest Bought out AirTran about 2 years ago...still two seperate cards and entities. I heard they like to keep them seperate for tax purposes even though both are owned by one airline
Apparantly they two are still operating as separate airlines while the AA and USA merger is going to result in one airline.
Yes, like Delta and Northwest. Like United and Continental. Like American Airlines and TWA. Technically AirTran is in transition after purchase and will become Southwest just like US Airways will become AA.