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Major flight delays caused by East Coast storms
(CNN) — Thunderstorms and low cloud over the East Coast complicate air travel as many Americans head to airports during the spring break season.

Thousands of flights are being delayed, with some delays of up to two hours, according to Federal Aviation Administration data.

As of 4:15 p.m. Thursday, more than 4,500 flights had been delayed, including more than 700 on Southwest, more than 560 on Delta, more than 370 on United and more than 560 on American, according to FlightAware flight tracking data.

Thunderstorms and clouds in the New York area have caused air traffic controllers to halt flights departing to New York’s LaGuardia Airport, according to the FAA. Delays at John F. Kennedy International Airport lasted more than an hour and a half and were approaching that mark Thursday afternoon at nearby Newark Liberty International Airport.

The storms also affected air travel in Florida, according to the FAA. Delays ranged from 15 to 45 minutes in Orlando, Miami and Tampa on Thursday afternoon.

As of Wednesday, more than 5,700 flights within, to or from the United States were delayed, according to FlightAware.

Flight delays also hit travelers over the weekend during the busy spring break season.

More than half of Saturday flights on Southwest Airlines have been canceled or delayed due to “intermittent technology glitch, as well as ongoing weather issues,” according to a Saturday night tweet from the airline.

According to FlightAware, 35% of Spirit Airlines flights, along with 33% of JetBlue flights and 10% of Southwest flights were canceled on Sunday.

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