Airlines owe you a lot less than you’d think when weather gets in the way of your flight

Sunday was a rough day for many air travelers, and some are still struggling to get to their destinations.

Nearly 2,500 U.S. flights were canceled and more than 9,800 flights were delayed Sunday, according to flight tracker FlightAware. More than 1,500 flights are canceled and over 3,000 more are delayed as of noon E.T. Monday.

American Airlines appears to have been particularly impacted with nearly 20% of their flights canceled and a third delayed on Sunday.

“American Airlines is monitoring the track of Tropical Storm Debby and has issued a travel alert allowing customers whose travel plans are affected to rebook without change fees,” the airline said in a statement to USA TODAY on Monday. “Customers can reschedule their travel on aa.com or by contacting Reservations at 800-433-7300 in the United States or Canada. American will continue tracking this system with our customers’ and team members’ safety top of mind.”Its cancellations were down to 10% and delays down to 12% Monday, according to FlightAware, but social media is still peppered with frustrations from stranded travelers and videos of long airport lines for customer service.

“Our Reservations team is working diligently to support our customers during this period of higher call volume. We encourage customers to leverage aa.com or the mobile app, which supports nearly all needs a customer may need for their travel. Our team can also be reached through X at @AmericanAir or through Chat in the mobile app and aa.com.,” American added.

Not all the disruptions are due to the storm, which made landfall in Florida Monday morning. There was also severe weather in the West, Midwest and East Coast on Sunday, according to the NOAA/National Weather Service Storm Prediction Center. Across airlines, upwards of one in four Sunday flights were delayed in cities as far ranging as San Diego, Detroit, Charlotte and New York.

Severe weather can also have a cascading effect on flights. And when weather is to blame, travelers are often stuck in a bind because airlines are not required to offer anything but refunds or rebooking when cancellations are outside their control. Here’s what travelers should know.