Southwest Airlines is trading at $40.77, up 4.20%, after airlines announced capacity reductions amid sharply higher jet-fuel prices.
- Southwest Airlines reduced planned 2026 capacity growth from roughly 2%-3% to about half that level as fuel costs rose.
- Strong autumn revenue and resilient travel demand support the sector, while capacity discipline may protect margins.
- Broader risk-on sentiment is supportive, with major U.S. indices higher on September 17, 2026.