Over the weekend, airlines across the U.S. canceled over 2,500 flights to smaller cities with lower traffic in particular amid the Federal Aviation Administration (FAA)’s order to cut flight numbers by 10% at 40 of the busiest airports across the country.

Major U.S. carriers, including Delta Air Lines, American Airlines, United Airlines, and Southwest Airlines, have canceled hundreds of flights in response to the FAA’s directive, reducing air travel and impacting millions of travelers.