NEW YORK (AP) — Southwest Airlines canceled hundreds of flights over the weekend, blaming the woes on air traffic control issues and weather.

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The airline canceled more than 1,000 flights, or 28% of its schedule as of 5 p.m. ET Sunday, according to flight tracker FlightAware.

The cancellations mark the highest rate by far of the major U.S. airlines.

Next in line are Allegiant and Spirit, both of which had canceled 5% and 4% of its flights respectively, according to the flight tracker.

American Airlines canceled 2% of its flights. Southwest said in a statement that it is working diligently to reset operations and is allowing customers to rebook themselves on their website.

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