Pictures: Orbitz.com busiest airports for Thanksgiving 2015

A TSA officer screens an airline passenger in Terminal C at Dallas/Fort Worth International Airport December 27, 2009 in Dallas, Texas.

FILE - In this July 25, 2013 file photo, a United Airlines plane, top left, takes off from Newark Liberty International Airport, in Newark, N.J. The Justice Department sued Tuesday, Nov. 10, 2015, to block a deal that would have allowed United Airlines to acquire 24 takeoff and landing slots at Newark Liberty International Airport. Federal officials said the deal with Delta Air Lines would have given United, already the dominant airline at the airport, an even greater competitive advantage that would have driven up fares for the 35 million passengers who fly in and out of Newark every year.

In this Monday, Aug. 31, 2015 photo, passengers line up at security check points before heading to their departure gates at Orlando International Airport in Orlando, Fla. The state’s second-busiest airport has embarked on a $1.1 billion expansion, the largest in two decades, for a new garage, check-in kiosks and a train terminal to service the privately funded All Aboard Florida line which will run from Orlando to Miami in two years.

People arrive at the international arrivals terminal at New York’s John F. Kennedy Airport (JFK) airport on October 11, 2014 in New York City.

Passengers line up to check in at the Delta Airlines ticket counter in Logan International Airport in Boston.

A plane, right, is de-iced at Denver International Airport in Denver, after a powerful wintery storm dumped heavy snow on parts of Colorado, Tuesday, Nov. 17, 2015. A snow-covered Longs Peak is in the background.

Travelers line up at a ticket counter at the San Francisco International Airport Sunday, Nov. 22, 2015, in San Francisco.

Passengers walk through Terminal 3 at O’Hare International Airport on Saturday, Nov. 21, 2015, in Chicago.

In this Saturday, Nov. 14, 2015, photo, lighted pylons at the entry road to Los Angeles International Airport display the blue, white and red colors of the flag of France following the attacks in Paris that killed scores and injured hundreds.