NEW YORK (AP) — Southwest Airlines canceled close to 2,000 flights over the weekend, blaming the woes on air traffic control issues and weather.  The airline canceled more than 1,000 flights or 29% of its Sunday schedule, as of 7 p.m. ET, according to flight tracker FlightAware.  That was the highest rate by far of the major U.S. airlines.  Next in line was Allegiant, which canceled 6% of its flights. American Airlines canceled 5% of its flights, while Spirit canceled 4% on Sunday, according to the flight tracker.

On Saturday, Southwest Airlines canceled more than 800 flights.

Harteveldt says the most troubling reason is the likelihood that some pilots who oppose Southwest’s decision to mandate COVID vaccinations are participating in a “work slowdown.”

The moment Orlando Airport travelers were informed of the cancellations.