Widespread flight cancellations are moving from the Deep South into the Northeast and Great Lakes as a big winter storm threatens to dump...

Widespread flight cancellations are moving from the Deep South into the Northeast and Great Lakes as a big winter storm threatens to dump a foot of snow or more on New York and Boston.

By midafternoon Tuesday, Delta Air Lines had canceled 1,700 flights, many in Atlanta, and American had scrubbed 500 flights, including more than 100 in Chicago. Many evening flights to the Northeast were also cut. Delta canceled two departures to Atlanta out of Sea-Tac airport Tuesday. US Airways canceled a flight to Charlotte.

Alaska Airlines said it would waive change fees for travelers scheduled to fly to Boston on Wednesday, if new travel is completed on or before Saturday. Travelers planning to fly into Newark on Tuesday or Wednesday can change their tickets to fly anytime on or before Friday. Tickets in both cases must be reissued by Wednesday.

Sea-Tac airport showed no flights yet canceled for Wednesday out of Seattle.

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Nationwide, US Airways canceled nearly 1,000 flights Tuesday and 340 for Wednesday.

American canceled 500 flights, including more than 100 in Chicago, on the western edge of the snowy weather front. The airline also canceled many flights that would end Tuesday night between Washington and Boston so that the planes wouldn’t be snowed in Wednesday morning, said spokesman Ed Martelle.

To the south, airports including Atlanta’s Hartsfield-Jackson International, the world’s busiest, struggled for a third day with snow and ice. About 1,900 flights were canceled throughout the Southeast on Tuesday, according to flight-tracking website FlightAware.

AirTran Airways, which shut down its Atlanta hub Monday, said flights were resuming Tuesday but with delays and some new cancellations.

Airlines reported huge numbers of calls to reservations centers from passengers looking to rebook.