Southwest Airlines: Often the most frequent and budget-friendly option for DFWA–TPAA nonstop travel, with two free checked bags but open seating; great for leisure travelers in September who value price and baggage savings. American Airlines: Offers consistent nonstop service with a traditional seat assignment model and strong DFW hub connectivity; a solid choice for frequent flyers seeking loyalty benefits. Delta & United: Typically provide one-stop options through their hubs (ATL, IAH) and can be competitive on price when booked in advance; ideal if you’re collecting miles in those programs. When comparing carriers in September, weigh fare, baggage fees, schedule convenience, and loyalty program benefits. CTA: Compare fares across Southwest, American, Delta, and United for your September travel dates to TPAA.