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United Airlines

hiked its checked bag fee by $10 on Thursday, becoming the second U.S. carrier in less than a week to raise the fee as the industry grapples with this year’s surge in fuel costs, airlines’ biggest expense after labor.

United’s new fee will be $45 to check a first bag on most domestic itineraries if the traveler pays ahead of time and $50 if they pay within 24 hours of their flight.

“United is raising first and second checked bag fees by $10 for customers traveling in the U.S., Mexico and Canada and Latin America beginning with tickets purchased Friday, April 3,” the carrier said.