Travelers across the U.S. are feeling the effects of the government shutdown as air traffic controllers are calling out sick, said the nation’s top transportation official.

At a Monday press conference, Transportation Secretary Sean Duffy said there has already been a small uptick in controllers — essential federal employees who are required to work without pay throughout the shutdown — calling out sick in a few places.

Hollywood Burbank Airport’s air traffic control tower sat empty on Monday evening, reported the New York Times . Flight management at Burbank was instead performed by workers at the Southern California Terminal Radar Approach Control in San Diego, resulting in average incoming delays of around two and a half hours.

Staffing shortages also created delays at Newark a

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