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Passengers wait to board a train in New York's Penn Station ahead of Thanksgiving.
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People wait in line at the Amtrak station in downtown Milwaukee ahead of Thanksgiving.
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A traveler sleeps at Union Station in Los Angeles as trains are delayed ahead of Thanksgiving.
Jae C. Hong/AP
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Passengers wait in baggage claim at George Bush Intercontinental Airport in Houston.
David J. Phillip/AP
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Travelers wait for their baggage at an American Airlines baggage claim at Chicago's O'Hare International Airport as 400 flights were delayed while people tried to travel home for Thanksgiving.
Charles Rex Arbogast/AP
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A woman entertains a baby while waiting at the Greyhound Bus Terminal in Denver ahead of Thanksgiving.
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Traffic is bumper to bumper south-bound on I-395 headed out of Washington before the Thanksgiving holiday in Alexandria, Va.
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Airline passengers wait in line to go through security at George Bush Intercontinental Airport in Houston.
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An explosives detection Labrador retriever sniffs bags, passengers, and the air at Will Rogers Airport in Oklahoma City as travelers head out of town for the Thanksgiving holiday.
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An unidentified woman and her son mark a suitcase at the Jet Blue check-in area in the Fort Lauderdale airport ahead of Thanksgiving.
J. Pat Carter/AP
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Passengers wait to board a train in New York's Penn Station during Thanksgiving holiday travel.
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A sign alerts travelers to expect holiday traffic in Houston.
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