Hundreds of flights were delayed on major U.S. airlines ahead of the Labor Day holiday.

According to the cancellation tracker FlightAware, more than 3,600 flights were delayed within, into or out of the U.S. on Saturday, as well as 145 cancellations.

Expect more delays and cancelations throughout the weekend. As of Sunday morning, about 300 flights within, into or out of the U.S. have already been delayed along with dozens of cancellations.

These delays come as the American Automobile Association forecasts about 32% of Americans will travel this Labor Day weekend.

The federation predicts this will be the busiest Labor Day travel weekend in three years, reaching pre-pandemic status, according to Fox Weather.