Delta Air Lines has expanded its flight waiver policy to all flights across its domestic network.
It will also allow free changes for flights regardless of when the booking was made, a first for a US airline.
The airline had already offered free changes for all international services.
The waiver is valid for original travel through April 30.
"We have adjusted flight schedules to affected areas, waived many change fees and are working with customers to adjust travel plans, using relationships with other airlines when needed,” the airline said.
US airlines had been criticized for only allowing flight waivers for new bookings made from the start of March, leaving travelers who planned and booked travel months ago on the hook for flight change penalties of $200 or more.
Last week Sen. Richard Blumenthal wrote to airline CEOs urging them to treat all customers fairly.
"Airlines should enable consumers to adjust their travel plans – regardless of when those decisions are made or when a passenger’s ticket was purchased,” he wrote.
