Airlines cancelled hundreds more U.S. flights this weekend, causing delays at major airports in New York City and elsewhere as federal authorities curtail air traffic because of the government shutdown.

Out of 21,748 flights scheduled on Saturday, about 3.7% had been cancelled as of 8:45 a.m. New York time, according to data compiled by aviation analytics company Cirium. American Airlines Group Inc., United Airlines Holdings Inc. and Delta Air Lines Inc. were the most affected.

Many flights that did eventually take off were delayed by hours. On Friday, airlines cancelled about 3% of 25,375 scheduled flights.

Newark Liberty International Airport was experiencing average delays of over four hours on Saturday, according to Federal Aviation Administration data. John F. Kennedy International

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