Dense fog is continuing to cause misery for Christmas holiday travellers at Heathrow and other UK airports.
Hundreds of domestic flights and some international flights are grounded.
Heathrow has been the worst hit, with 40,000 people affected, and services from Gatwick, Manchester and Cardiff have also been disrupted.
Passengers said they were angry about a lack of information. Fog is forecast on Friday and BA says all domestic flights to and from Heathrow will be cancelled.
About 350 flights out of Heathrow have been cancelled on Thursday, a 40% reduction.
Napil Berry, 37, from Nottingham, said he had missed his sister’s wedding in Stockholm.
Sitting outside the terminal concourse, he said: "I told my sister I’m not going to make it. She said: ‘Try to come in time for Christmas.’
“I’m not angry with BA about it but I am angry and upset I missed my sister’s wedding.”