Northern Europe, reeling under ice, snow and sub-zero temperatures, suffered travel hazards as flights across the region were delayed on Monday.
The extreme weather forced many airports to close. Europe's busiest airport Heathrow, near London, reopened in the morning after severe restrictions on flights over the weekend.
Germany's Frankfurt Airport was one of the worst-affected, where the cancellation of almost 500 flights left hundreds of travelers stranded.
Flights are due to resume at midnight in the major French airport of Charles de Gaulle Airport. Air traffic crippled also in Spain, the Netherlands and Croatia. Airports in Amsterdam and Brussels could operate only partially.
Television news channels beamed scenes of passengers sleeping overnight at airport terminals, including at Heathrow and Zaventem airport in Brussels.
Air and road transport disruptions are expected to continue in the coming days, as another day of sub-zero temperatures and snow showers are forecast in Britain, making driving conditions very dangerous around the country.
Rail service between Britain, France and Belgium and between France and Belgium were also affected by snowfall.
Bus services were canceled and heavy goods vehicles were barred from major routes following snowfalls in Paris.
Northern Europe is experiencing one of the coldest winter seasons on record.
Some schools in Britain were closed ahead of Christmas holidays due to bad weather.
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