Severe fog has caused travel problems across the UK.
Here is the latest flight information:
Heathrow Airport: 184 of 500 British Airways flights have been cancelled. Of those 84 are domestic and 100 are European or short-haul.
So far, 18,500 customers have been hit and the airport has suffered a 40% reduction in capacity.
All BA's domestic flights for Friday have been cancelled, as have some European flights. In total it has cancelled 100 flights. Passengers due to travel on a flights which has been cancelled are urged not to travel to the airport.
BMI have cancelled 43 of a planned 170 flights, with the rest subject to delay.
Gatwick Airport: 16 of 200 flights cancelled today, all short-haul or European. 1,600 passengers affected.
There are no specific figures on delays at either airport, but they are inevitable because planes are in the wrong place following the recent spate of cancellations.
Stansted Airport: Unaffected by weather conditions.
Southampton Airport: 16 flights cancelled. Arriving and departing flights are also being delayed by up to two hours - passengers advised to check with BA or BMI before flying.
Glasgow Airport: A small number of domestic flights have been cancelled, and flights are subject to delays - passengers advised to check with BA or BMI before flying..
Edinburgh Airport: A small number of domestic flights have been cancelled, and flights are subject to delays- passengers advised to check with BA or BMI before flying..
Aberdeen Airport: A small number of domestic flights have been cancelled, and flights are subject to delays- passengers advised to check with BA or BMI before flying..
Belfast Airport: No fog, one BMI flight cancelled for different reasons.
Manchester Airport: Nine BA flights to Heathrow cancelled due to fog at Heathrow. BMI flights still running as they go to London City Airport. Manchester advises passengers that failure to adhere to new hand luggage restrictions is causing length delays.
Luton Airport: Airport still operating despite fog - two flights delayed, no cancellations.
Tees Valley/Darlington Airport: Two flights to and from Heathrow cancelled
There have also been problems at Norwich, Cardiff, Coventry and Birmingham.
All airports advise passengers planning to fly on Friday to contact their airline, rather than the airport.
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