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Seven flights were cancelled at Heathrow and three at London City airports by 6:30am on November 9 due to thick fog in London. The Met Office issued a yellow weather warning valid until 11am for London and most of the South East.

Early on November 9, 2026, seven flights at Heathrow and three at London City were canceled due to dense fog reducing visibility to under 50 metres. The Met Office issued a yellow warning for London and South East England until 11am.

On November 9, 2026, there were 1,331 flight delays and 59 cancellations in the U.S., mainly due to thunderstorms and low clouds. The FAA listed Boston, New York, Philadelphia, and Washington D.C. area airports as affected sites.