Airlines have already canceled almost 500 flights for Monday as a late-season snowstorm threatened to make a mess of air travel this week. The markets affected include New York City, Newark, Boston, Washington D.C, Philadelphia and Baltimore.
All major US airlines are waiving change fees to fliers whose flights have been canceled. Restrictions vary by airline.
Airlines canceled more than 8,000 flights between Sunday morning and Tuesday afternoon.
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Southwest said it has cancelled more than 1,300 flights until Wednesday. For example, an Orlando-to-Houston flight could be delayed or canceled if the aircraft or crew scheduled to fly it get knocked off schedule because of the problems in the Northeast.
Forecasts called for snow, heavy at times, Tuesday night throughout much of western and northern New England and upstate NY. All were likely to see major schedule disruptions if forecasts are accurate.
American Airlines has also issued a change fee waiver for travelers booked through Chicago O'Hare or airports in the northeastern United States. Flights leaving Cancun bound for specific U.S. cities were also canceled due to the bad weather. Even in Florida, about three dozen flights had been canceled in Orlando - mostly on flights to the north. For Philadelphia travelers, flights before 5 p.m. ET on Tuesday were canceled with operations expected resume on after 5 p.m. Tuesday.
Delta: Customers traveling through any of the affected airports on March 14 or 15 can rebook for flights through March 17 without paying a change fee.