Southwest Airlines has canceled at least 1,000 Sunday flights as of 12 p.m. ET, according to flight tracker FlightAware, coming after numerous cancelations were reported Saturday. “We experienced significant impact in the Florida airports [Friday] evening after an FAA-imposed air traffic management program was implemented due to weather and resulted in a large number of cancellations,” Alan Kasher, who oversees Southwest’s flight operations, in a statement obtained by several news outlets on Saturday. About 800 Southwest flights were canceled on Saturday, according to flight-tracking website FlightAware. Other major carriers, including American Airlines and Spirit Airlines, appeared to have significantly fewer disruptions. The Epoch Times has contacted Southwest for comment, including regarding whether the cancelations were due to staffing shortages related to the firm’s recently announced COVID-19 vaccine mandate for employees. The Federal Aviation Administration (FAA), which oversees air traffic in the United States, also didn’t immediately respond to a request for …