-Full details: United Airlines

US Airways

-Waiver highlight: One change to itinerary, with some restrictions.

-Applies to flights booked for: Jan. 21-22.

-Can rebook for travel on: Jan. 20-24. Otherwise, the fee will waived but the airfare may be recalculated.

-Cities covered under waiver: Allentown, Pa.; Baltimore/Washington; Boston; Charleston, W. Va.; Charlottesville, Va.; Halifax, Canada; Harrisburg, Pa.; Hartford, Conn.; Huntington, W. Va.; Long Island/Islip, N.Y.; Lynchburg, Va.; New Haven, Conn.; New York JFK; New York LaGuardia; Newark Liberty; Newburgh, N.Y.; Philadelphia; Providence; Richmond, Va.; Roanoke, Va.; Salisbury, Md.; Scranton/Wilkes-Barre, Pa.; Washington Dulles; Washington Reagan National.

-Full details: US Airways