Several inches of snow were forecast to fall in the Washington area on Monday. Mayor Muriel Bowser declared a snow emergency for most of the day.
Passengers wait in line at St. Louis-Lambert International Airport in St. Louis, Mo., on December 26. Since the week of Christmas, thousands of flights have been canceled in the United States. Photo by Bill Greenblatt/UPI
Monday's cancellations follow thousands of other disrupted flights across the United States since the week of Christmas. More than 4,600 were canceled on Sunday.
Chicago O'Hare International Airport saw nearly a quarter of its flights canceled on Sunday, Denver International Airport canceled almost 20%, Houston Bush Intercontinental Airport 12% and Atlanta Hartfield-Jackson and Newark Liberty airports 11%.
There were more than 5,000 cancellations and almost 20,000 delays affecting U.S. flights over the weekend, making it the most affected two-day stretch of the holiday season for air travelers.
Some airlines are paying their crews extra to avoid cancellations for the next few weeks. Last week, JetBlue canceled hundreds of flights through mid-January to avoid scrapping them at the last minute.