Over 3,500 flights have been cancelled in the United States so far this Memorial Day weekend.

This Memorial Day weekend, which marks the start of the summer travel season, airline passengers are dealing with more than just price shock. They're also coping with a backlog of cancelled flights.

According to flight tracking website FlightAware, more than 1,500 flights had been cancelled as of 9:50 p.m. EDT Saturday. On Friday, there were almost 2,300 cancellations.

Delta Air Lines took the brunt of the damage among US carriers, with over 250 flights, or 9% of its operations, cancelled on Saturday

Travel delays were severe at Atlanta's Hartsfield-Jackson International Airport, where Delta is based and has its largest hub. 

5 percent of flights were cancelled on Saturday, while 16 percent were delayed.

In an email to The Associated Press, Delta explained that the cancellations on Saturday were due to poor weather and "air traffic control operations."

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