Passengers face delays and cancellations at airports on Monday after snow, ice and freezing fog swept the UK.
Gatwick and Stansted airports closed their runways on Sunday due to the bad weather.
Flights have since resumed but many have been cancelled or pushed back.
A yellow weather warning is in place for Scotland, Northern Ireland, much of England and parts of Wales, with disruption set to continue.
Trains have also been delayed and drivers warned to take care after several motorway accidents.
Those travelling to UK airports have been urged to check their travel plans and flight status with their airline before setting off.
About 90 departures were cancelled from Gatwick between midday and midnight on Sunday, with at least a further 37 cancelled on Monday.
EasyJet was the worst affected airline, while flights were also cancelled or delayed at Heathrow, Gatwick and Manchester airports.
Luton Airport has seen about two dozen cancellations.
London City Airport also said it is “experiencing some disruption this morning” due to aircraft being out of position after the “significant amount of cancellations” on Sunday night.
James Love told the BBC he was stuck on a Loganair plane at Stansted for several hours on Sunday evening, which was unable to take off.
“The captain wanted to de-ice the wing,” he said. “But by the time the ground crew had come over to do that and the plane was ready, the runway shut and we had to return to stand.”
However, he said the crew had been great and made the “whole thing a lot better, or at least as good as can be for this kind of situation”.
Heathrow and Gatwick affected
More than 50 flights were cancelled at Heathrow on Sunday, after freezing fog resulted in air traffic control restrictions on the number of aircraft that could land and depart per hour.
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The airport said it was keeping passengers safe and trying to get them to their destinations as quickly as possible.
“We encourage passengers to check their flight status with their airline for the latest information,” a spokeswoman said.
British Airways, Heathrow’s biggest airline, said it had apologised to customers and was refunding or rebooking anyone whose flight had been cancelled and providing refreshment and hotel vouchers where needed.
It has cancelled more than 70 flights alone to and from the airport on Monday, mostly on European and domestic routes.
