The Federal Aviation Administration said Monday that a nationwide shortage of air traffic controllers has led to thousands of flight delays as the government shutdown enters its 20th day.

Roughly 7,923 flights within, into, or out of the United States were delayed on Sunday, FlightAware reported , with more than 4,500 additional delays recorded so far Monday. That’s well above the year’s daily average of about 4,100 delays. More than 20% of flights operated by American Airlines and Southwest Airlines were affected Sunday.

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Weekend air travel was disrupted in several major cities, including Atlanta, Chicago, Dallas, and Newark, due to staffing shortages, the FAA said,

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