These are the airports with the most delays during last year's Christmas travel period - this year is expected to be even busier

1. Seattle-Tacoma International Airport (SEA)

9. San Francisco International Airport (SFO)

8. John F. Kennedy International Airport (JFK)

7. Houston George Bush Intercontinental Airport (IAH)

6. Charlotte Douglas International Airport (CLT)

5. Denver International Airport (DEN)

4. Dallas Fort Worth International Airport (DFW)

3. Los Angeles International Airport (LAX)

2. Atlanta Hartsfield-Jackson International Airport (ATL)

1. Chicago O'Hare International Airport (ORD)