Adverse weather conditions have caused problems at airports as several flights were grounded after ice and freezing fog descended on the UK.
Heathrow Airport said more than 20 flights due to take off tomorrow had been cancelled. A spokesman said more cancellations and delays were expected as conditions worsened.
Some flights have been cancelled and some are being cancelled tomorrow morning because of fog.
It's better to cancel flights when there's fog because in fog you can't land as many planes per hour because you have to leave more space between the planes.
Cancelled flights included scheduled trips to Warsaw, Nice, Stockholm, Aberdeen and several German cities.
Clear skies and light winds are a recipe for fog to develop, so allow extra time to defrost your car and check before you travel.
It's another bitterly cold day today. It's all down to where the air originates from - and today's can be traced back to Russia.