London Heathrow Airport

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A British Airways plane is seen through dense fog on the tarmac at Heathrow Airport, London, Monday, Jan. 23, 2017. Thick fog has caused numerous flight delays and cancellations at London Heathrow and other area airports. The Met Office forecasting service said visibility at Heathrow had been reduced to roughly 100 meters (yards), leading to an overall slowdown in operations. (Steve Parsons/PA via AP)

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Etihad Airways A340-500 (A6-EHB) takes off from London Heathrow Airport, England. (Wikipedia)

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**FILE** Emergency services attend a British Airways passenger plane after it had to make an emergency landing at Heathrow Airport on May 24, 2013. (Associated Press)

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Russian tennis player Elena Vesnina talks with an Olympic volunteer after arriving at Heathrow Airport outside London on Wednesday, July 18, 2012, as the city prepares for the 2012 Summer Olympics. (AP Photo/Charlie Riedel)

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Members of the U.S. Olympic sailing team are escorted following their arrival at Heathrow Airport in London, Monday, July 16, 2012. Heathrow is set to welcome a record number of passengers Monday as athletes begin arriving for the London Olympics. (AP Photo)