More than 13,000 flights were canceled this weekend, as a powerful winter storm hit much of the United States, delivering freezing rain, sleet, treacherous ice and major snowfall to cities including New York.

The giant storm, which swept east from Texas through the mid-South and up to the Northeast, has disrupted transportation and daily life across the country. Flight disruptions will linger through the coming days as airlines work to restore their flight schedules and get stranded travelers back home.

Here’s what to know if you’re planning to travel.

How many flights are being canceled?

Nearly 10,000 flights on Sunday were canceled across the United States as of 3:30 p.m. Eastern time, a scale of disruption not seen since the early days of the Covid-19 pandemic, according to Cirium, an aviation analytics firm.

Sunday’s flight cancellations were double the number of flights shelved the previous day, when airports in the Southern Plains and Southeast were most affected.

The picture for air travel is brightening, with less than 2,000 flights on Monday canceled. JetBlue Airways has canceled nearly a third of its scheduled flights on Monday, the highest cancellation rate among all major U.S. airlines. The airline said in a statement online that it planned to add additional flights once the storm passed and airports reopened.

Despite fewer cancellations on Monday, the challenges of continued icy weather and residual impacts from this weekend’s disruptions remain, a United Airlines spokesperson said in a statement. In the storm’s aftermath, airlines have to reposition planes and crew and potentially boost staffing at major airports.

The storm significantly disrupted flights at major East Coast airports on Sunday, including those serving Atlanta, New York, Washington and Charlotte, N.C. LaGuardia Airport remains closed through Monday morning, according to the Federal Aviation Administration.

Airlines canceled all flights on Sunday at Ronald Reagan National Airport. Nearly every flight was canceled on Saturday at Philadelphia International Airport, Raleigh-Durham International Airport and Newark Liberty International Airport, according to FlightAware.

Several smaller airports around the country also closed, including Greenville-Spartanburg International Airport in South Carolina, according to the F.A.A.

Are airlines waiving rebooking fees?

Travelers who no longer want to fly this weekend or on Monday can generally rebook without incurring extra costs.

United Airlines, Southwest Airlines, Delta Air Lines, American Airlines, Spirit Airlines, Alaska Airlines and JetBlue Airways are among the carriers allowing flexible rebooking if you’re traveling through dozens of cities, including Atlanta, Boston, Cleveland, Houston, New York and Washington.

Eligible flights differ by airline; several are offering waivers for flights scheduled through Tuesday.

How do I know if my flight is delayed or canceled?

Monitor your flight using your airline’s app, as updates could appear there first. You can also look at websites like Flightradar24, FlightAware and the National Airspace System Status to get a sense of delays and cancellations across the country.

What if my flight is disrupted?

In the United States, if your flight is canceled, significantly delayed or changed, airlines will rebook you (or at least try to rebook you) on another flight. If you decide not to fly, the airline owes you an automatic refund, in your original form of payment, within 20 days.

Don’t expect airlines to cover your food or accommodation costs if you’re stranded; weather isn’t one of the variables, unlike staffing and maintenance, that are under their control. Travel insurance, including coverage through a credit card, may be helpful in this scenario.

What if I’m taking the train?

Amtrak has fully or partly canceled the majority of trains across the East Coast, Midwest and South between Friday and Sunday. Affected routes include the Empire Builder, which travels between Chicago and the Pacific Northwest; the Heartland Flyer, which connects Oklahoma City and Fort Worth; the Cardinal, which connects New York and Chicago via Cincinnati; and the Acela between Boston and Washington.

Those on affected trains are being offered refunds and rebooking options without extra fees, the railroad said. The number of cancellations may rise depending on how the storm develops.

Passengers can check Amtrak’s website or app for more details on their train’s status, as well as sign up for delay alerts. Those seeking to change their reservations can contact the company’s reservation center at 1-800-USA-RAIL.

How about the bus?

FlixBus, Greyhound and Megabus are all warning of potential delays or cancellations. Megabus, which has suspended some routes in the Northeast on Sunday, said affected customers can get a refund or reschedule at no extra cost. All three companies said they would contact passengers directly via email and text if their itineraries are disrupted.

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