Nasty weather is already complicating travel in parts of the United States, with forecasts of snow, thunderstorms and more threatening a sloppy Christmas Day from Texas to Florida.
The wintry mix of precipitation prompted some flight delays and cancellations at Dallas-Fort Worth International Airport on Tuesday.
DFW Airport reported 415 cancellations from all airlines combined as of 10 p.m.
Some travelers will be stranded in the terminal overnight. The concessions will remain open until midnight or 12:30 a.m. so people can eat.
Passengers on arriving flights Tuesday night reported being stuck on the tarmac for hours.
Airlines began de-icing operations for departing flights on Tuesday afternoon.
The airport said that de-icing operations typically take an extra 20 minutes for each departure, so passengers should expect some departure delays. Fortunately, today's flight schedule is lighter than normal because of the Christmas holiday.
DFW is advising all passengers to check on their flight status prior to going to the airport.
Many roads in and out of the airport have been treated with liquid de-icer. However, the flyover bridges to the terminals are closed, so drivers are asked to leave earlier so they have extra time for the detours to the terminals.
Runways are also being monitored.