Thousands of flights have been canceled or delayed as a has struck multiple northeastern states, throwing air travel into disarray.

The storm, which has dropped over two feet of snow in certain areas, prompted the governors of Connecticut, Delaware, Massachusetts, New Jersey, and New York to and urge residents to exercise caution. The blizzard also left air travelers scrambling: more than 3,400 flights within, to, or from the U.S. were canceled on Sunday, per the flight-tracking platform , and nearly 8,000 such flights were delayed. Disruptions have continued on , with over 2,700 flights delayed and more than 5,600 canceled by the afternoon.

Airports across the Northeast shared social media updates about storm-related air travel disruptions, advising travelers to check their flight status with airlines. Rhode Island T.F. Green International Airport Monday morning that it had “temporarily suspended all airport operations” due to inclement weather. The airport noted officials would keep monitoring conditions and “resume operations as soon as it is safe to do so.”

Air travel disruptions could extend beyond Monday; some airlines have already canceled flights scheduled to depart on Tuesday.

Here’s what to do if the blizzard disrupts your flight.

Keep checking your flight’s status with your airline

Checking your flight status with the airline before heading to the airport is always smart, but it’s especially crucial now. You can also check the website or to see conditions at your departure airport—like if it’s closed due to the blizzard or has significant delays.

If your flight is still set to depart, you may want to arrive at the airport earlier than usual, as there could be long lines and major delays.

Once at the airport, keep checking flight monitoring screens to stay up-to-date on your flight’s status.

If your flight is canceled, contact your airline

If you learn your flight has been canceled, reach out to your airline’s customer service. If you’re at the airport, visit the carrier’s help desk in person. You can also call the airline’s customer service line or go to their website. Once you connect with customer service, you can rebook your flight—many airlines will do this at no extra cost.

If you decide not to rebook your canceled flight, you are to a refund.

If your flight is delayed, be patient

Weather is unpredictable, and airport and airline staff are working hard to minimize the impact on customers’ travel plans while ensuring the safety of passengers and crew. While delays can be frustrating, try to be patient.

You may also want to consider adjusting your travel plans to avoid disruptions as much as possible. Airlines including , , , and have waived fees for eligible customers who rebook their flights.