It looks like some passengers may have to pay a little more to fly.
Delta Air Lines says its passengers are paying higher fares on average for the first time in more than two years.
In addition, both Delta and American Airlines say they expect their fares to climb higher.
U.S. airlines have struggled to raise fares in recent years due to low fuel costs, additional flights and greater competition.
However, Delta says fuel and labor costs are rising again, and that, along with the strong demand for air travel, justifies raising fares.