Airports in U.S. cities including Denver; Newark, New Jersey; and Burbank, California , experienced flight delays Monday amid shortages of air traffic controllers, according to federal flight data.

Federal officials have flagged more air traffic control facilities for low staffing levels in recent days than they have since the summer of 2022, when the post-COVID travel boom sent delays and cancellations soaring, according to a CBS News data analysis of Federal Aviation Administration airspace advisories.

The shortage of air traffic controllers at some airports comes as the U.S. government shutdown that has shuttered federal agencies continues into a second week.

Flights into Hollywood Burbank Airport , which serves Los Angeles, were slowed until 1 a.m. Tuesday, resulting in av

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