Airline travelers are going nowhere fast because of the blizzard bearing down on the Northeast.
By midafternoon Monday, about 6,500 U.S. flights through Tuesday had already been scrubbed, according to tracking service FlightAware.com. Most were to or from a band running from Washington through New York to Boston.
And 1,700 flights had been delayed.
Cancellations and delays are likely to spill over into Wednesday, if not longer.
Airlines cancel flights before storms arrive to prevent passengers from driving to the airport and getting stranded in the terminal. Airlines also want to avoid having their planes stuck at snowed-in airports.
Most major U.S. carriers said they would allow passengers ticketed to, from or through the Northeast on Monday or Tuesday to change their plans without getting hit by a reservation-changing fee, typically $200.
The National Weather Service predicted that 2 to 3 feet of snow would fall in a 250-mile stretch of the Northeast, including the New York and Boston areas. Philadelphia was bracing for 14 to 18 inches.