Staffing shortages led to more flight delays at airports across the U.S. on Tuesday as the federal government shutdown stretched into a seventh day, while union leaders for air traffic controllers and airport security screeners warned the situation was likely to get worse.

The Federal Aviation Administration reported staffing issues at airports in Nashville, Boston, Chicago and Philadelphia, and at its air traffic control centers in Atlanta and the Dallas-Fort Worth area. The agency temporarily slowed takeoffs of planes headed to the first three cities.

Major flight delays a day earlier also were tied to insufficient staffing during the shutdown, which began Oct. 1. The FAA reported delays on Monday at the airports in Burbank, California, Newark, New Jersey and Denver.

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