It's a busy week for millions of Americans who are traveling for Thanksgiving .

At the nation's airports, the TSA expects to screen nearly 18 million people from the Tuesday before Thanksgiving to the Tuesday after the holiday, while the FAA expects this will be the busiest Thanksgiving in terms of flights in at least 15 years.

Most people, however, will be traveling by car. AAA projects that overall, 81.8 million people will travel 50 miles or more during the Thanksgiving holiday period.

"This year's domestic travel forecast includes an additional 1.6 million travelers compared to last Thanksgiving, setting a new overall record," it says .

Here is a look at the days that are expected to be the busiest for travelers.

Busiest days for flying

Eight of the busiest days in TSA

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