It’s been a rough weekend for airline passengers.

Airlines canceled and delayed more than 10,000 Saturday and Sunday flights because of storms in Florida and a technology issue at Southwest Airlines, stranding travelers across the country and creating long wait times to reach airline customer service. More than 3,200 flights have been canceled and 7,000 flights delayed this weekend, according to flight tracker FlightAware.

The flight woes come during the busy spring break travel season and at a time when travel is surging because of pent-up demand from the pandemic.

Southwest, the nation’s largest domestic carrier, was the hardest hit in terms of the number of flights. The airline canceled 520 Saturday flights, or 14% of its operation, and 396 Sunday flights.

In addition to weather, Southwest said it had intermittent technology issues early Saturday that hurt the airline.

Southwest, the nation’s largest domestic carrier, has previously said about 40% to 50% of its planes fly through Florida on any given day.