Thousands of flights across the U.S. were delayed Monday, as severe thunderstorms in the South, Plains and Mississippi Valley disrupted traveling Americans during the Memorial Day weekend. As of 4:30 p.m. EDT on Monday, there were over 4,300 flight delays and more than 125 cancellations in and out of U.S. airports, according to FlightAware.

This Memorial Day weekend is set to see the most people traveling since 2005, as AAA forecasts that more than 45 million people will travel at least 50 miles from home. “While this Memorial Day weekend isn’t expected to set an air travel record (set back in 2005 with 3.