Over 5,000 flights were canceled or delayed on the second day of Federal Aviation Administration cuts, an inconvenience that could get worse as Transportation Secretary Sean Duffy warns of more cuts.

As of 3 p.m. on Saturday, flight-tracking website FlightAware reported 1,030 flights within, into, or out of the U.S. were canceled, while another 4,211 were delayed. The tracker doesn’t distinguish between delays and cancellations caused by the FAA’s cuts and other factors, but the number of cancellations is several times higher than on previous days of the week.

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