The Federal Aviation Administration on Monday limited private flights at a dozen major U.S. airports as air traffic controller shortages snarled traffic around the country.

Here are the airports included in the new restrictions, according to the NBAA:

Chicago O’Hare International Airport (ORD)
Dallas Fort Worth International Airport (DFW)
Denver International Airport (DEN)
General Edward Lawrence Logan International Airport (BOS)
George Bush Intercontinental Airport (IAH)
Hartsfield-Jackson Atlanta International Airport (ATL)
John F. Kennedy International Airport (JFK)
Los Angeles International Airport (LAX)
Newark Liberty International Airport (EWR)
Phoenix Sky Harbor International Airport (PHX)
Ronald Reagan Washington National Airport (DCA)
Seattle-Tacoma International Airport (SEA)