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More than 24 million people are expected to fly this Thanksgiving weekend, about 150,000 more people than last year. This despite an increase in the price of airfare since Thanksgiving 2011.

And the crowds aren't just at the airport: Expect planes to be packed. Airplanes, on average, are expected to be nearly 90 percent full on the busiest day of one of the busiest travel weekends of the year.

READ MORE: 7 Guaranteed Ways to Save on Thanksgiving Flights

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But some airports will be busier than others. Orbitz, the travel booking web site, has just released the list of the busiest - and least busy - airports over Thanksgiving weekend 2012, based on the top 50 U.S. airports . If you're traveling out of one of the most busy airports, be prepared to arrive early and wait on lines.

Most Busy Airports Nov 21 - Nov 26:

1. Chicago O'Hare International
2. Los Angeles International
3. San Francisco International
4. New York LaGuardia
5. Boston Logan International
6. John F. Kennedy International
7. Orlando International
8. Denver International
9. Ronald Regan National
10. Ft. Lauderdale International

Least Busy Airports Nov 21 - Nov 26:

1. Buffalo Niagara International
2. Jacksonville International
3. Nashville International
4. Sacramento International
5. Bradley International
6. Palm Beach International
7. Cleveland Hopkins International
8. John Wayne Airport
9. San Antonio International
10. Salt Lake City International