CHARLOTTE, N.C. (AP) — US Airways is waiving the change fee for customers who must alter their flights due to severe Christmas weather.

The airline is canceling the $150 charge for changing flights to and from 25 cities where there are flight delays and cancellations. The offer is available to travelers scheduled to fly Wednesday and Thursday. They must keep the same flight origin and destination. Their rescheduled flights must be by New Year’s Day.

The affected airports are in Canada, Indiana, Maine, Michigan, New Hampshire, New York, Ohio, Pennsylvania, and Vermont.

Travelers can change their trip online at http://www.usairways.com/manageyourtrip or call 800-428-4322.

Severe thunderstorms are forecast for the Carolinas while a line of blizzard and winter storm warnings stretched from Arkansas up the Ohio River to New York and on to Maine.

(© Copyright 2012 The Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.)