Southwest Airlines reported record second-quarter revenue of $8.4 billion, a 16.4% increase from a year earlier, as the carrier leaned on higher ticket prices and added baggage fees to help balance rising expenses. The results show how airlines are adjusting pricing as operating costs remain under pressure.

A major factor in the quarter was fuel. Southwest’s fuel bill reached $889 million, making energy costs one of the biggest financial challenges for the airline. By raising fares and collecting more from ancillary charges such as baggage fees, the company worked to protect its revenue as those costs climbed.

The latest figures highlight a broader trend across the airline industry, where carriers are relying more heavily on both base fare increases and extra fees to support earnings. For Southwest, those pricing moves helped drive the strongest quarterly revenue in its history despite the burden of higher fuel spending.

Southwest’s performance in the quarter suggests demand remained strong enough for the airline to pass along at least some of those higher costs to travelers. Even so, the results also underline how sensitive airline profitability remains to fuel prices and other operating expenses.