The Federal Aviation Administration said late Sunday that air traffic control staffing issues were delaying travel at airports in Dallas, Chicago, Atlanta and Newark as a U.S. government shutdown hit its 19th day. The FAA said numerous staffing triggers had been received for the evening shift and flights could also be delayed in Las Vegas and Phoenix because of air traffic control absences.

FlightAware said more than 5,800 flights had been delayed on Sunday. Weather issues and a Formula 1 race in Austin were also impacting flights. More than 20% of American Airlines and Southwest Airlines flights were delayed Sunday, according to FlightAware.

Some 13,000 air traffic controllers and about 50,000 Transportation Security Administration officers must work during the government shutdown, but

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