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Travelers check themselves in at a kiosk at Philadelphia International Airport on September 2, 2022 in Philadelphia, Pennsylvania. Alex Wong/Getty Images
Airlines have delayed or canceled hundreds of flights during the U.S. Labour Day holiday weekend.
There were 743 delays within, into, or out of the United States, and 70 cancellations as of 11 a.m. ET Sunday, according to the flight tracking website FlightAware.
