Heathrow and London City Airport flights hit by fog
Flights to and from Heathrow and London City airports have been disrupted because of fog.
Heathrow cancelled 78 services while London City Airport cancelled at least 20 flights across the day.
The Woolwich Ferry service in London was suspended during the morning rush hour but services have since resumed.
It was the second day of disruptions, following flight delays and cancellations on Wednesday as a result of anti-austerity strikes in Europe.
Passengers have been advised to check with their airline before travelling to the airports.
A spokesperson at Heathrow said they had cancelled 39 inbound and 39 outbound flights for the day but otherwise services were operating without delays.
A statement from British Airways, which cancelled about 30 flights, said: "Customer safety is our top priority and as a precaution we have cancelled some short-haul flights due to the foggy conditions across the UK and Europe today.
"We have been contacting customers on affected flights, who have the choice of rebooking or claiming a refund, and are advising customers to check ba.com for the latest flight information."
Meanwhile, at London City Airport there was severe disruption throughout the morning and at least 20 cancellations during the day.
However, a spokeswoman said the fog had lifted and they expected things to have returned to normal by 17:00 GMT.