United Airlines raised its ticket change fees by $50 on April 18 to $200 for domestic tickets and $300 for international itineraries. Other airlines haven’t yet raised their change fees. But like baggage fees, rivals may well jump at a chance to raise fees ever higher.

A United spokesman confirmed the change on change fees. “We carefully manage our seat inventory and incur costs when a traveler elects not to fly in a reserved seat. We adjusted this fee to better compensate us for those costs,” spokesman Rahsaan Johnson said.