Airlines are waiving flight-change fees and fare differences for more than a dozen airports in the mid-Atlantic and Northeast U.S. ahead of a big coastal storm.

The National Weather Service issued flood and high-wind advisories for large parts of the region from Sunday through Monday evening.

American Airlines

waived fare differences and change fees for customers booked Sunday involving airports from Portland, Maine, to Newport News, Virginia, if they can travel later in the week.

Southwest Airlines