People in Sussex are being warned to expect disruption on the road and rail networks following forecasts of heavy snow across the county.
The Met Office said up to 2in (5cm) of snow had already fallen in places across the South East.
Temperatures are forecast to plunge overnight and up to 8in (20cm) of snow is expected to fall in some areas on Saturday.
Gatwick Airport has urged passengers to check with airlines before they travel.
Budget airline Easyjet said it had cancelled flights between 0600 GMT and 1000 GMT on Saturday from the West Sussex airport and expected further delays throughout the day because of the wintry weather.
Easyjet passenger Caspar Mahoney said he and 100 other people had been stuck on an aircraft on the runway at Gatwick on a plane bound for Pisa, in Italy, which was unable to take off because of ice.
A spokeswoman for Gatwick Airport said: "Weather forecasters are predicting heavy snow across most parts of the UK this weekend with the possibility of up to 20cm of snow.
"Severe weather warnings remain in place for the Gatwick area. Delays, disruptions and cancellations at the airport are likely this weekend.
"Gatwick Airport strongly advises passengers flying out this weekend to contact their airline to check their flight status before making their way to the airport.
"Passengers should also allow extra travel time to the airport as public transport and roads are likely to be affected - passengers should check with transport operators before planning their journey.
The Met Office has forecast up to 8in (20cm) of snow in the South East on Saturday.
A spokesman for the Met Office said: "The public are advised to take extra care and refer to the Highways Agency for further advice regarding traffic disruption on motorways and trunk roads."
Southern and Southeastern trains have cancelled some services on Saturday in anticipation of more bad weather.