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Fog has hit flights in London, Norwich and Southampton, with dozens of services having to be cancelled.
Heathrow had to axe more than 80 flights and there was also disruption to services at London City Airport.
The poor visibility led to the Woolwich Ferry service in London being suspended.
It was the second day running of flight disruptions, following delays and cancellations on Wednesday due to anti-austerity strikes across Europe.
Norwich airport was also affected by the fog, with some flights having to be diverted to other airports, and Southampton airport reported delays to flights from the Channel Islands.
They're now asking people to check with their airlines before heading to the airport.
British Airways was one of the airlines hit by the poor visibility.
''We are doing everything we can to help customers on flights disrupted by 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.
''We apologise to customers for the inconvenience and thank them for their understanding.''