Southwest Airlines reported a 9% increase in second-quarter profit, driven by higher fares that increasingly helped the carrier cover its rising fuel expenses.

Despite the year-over-year gain, the airline’s third-quarter outlook fell below Wall Street expectations, triggering a sell-off in the stock.

The divergence between strong past performance and cautious forward guidance highlights the persistent pressure on US carriers as they navigate volatile input costs and shifting demand patterns.

Shares of Southwest Airlines declined sharply in the session following the release.

The market reaction underscores investor sensitivity to forward-looking metrics, particularly when summer travel forecasts fail to meet consensus estimates.

While the second-quarter results demonstrated the carrier’s ability to pass costs onto consumers, the muted outlook for the upcoming quarter suggests that pricing power may be reaching its limits amid competitive pressures.