Swiss airspace reopened on Wednesday morning after a computer glitch grounded flights across the country for several hours, officials said.
"Swiss airspace is now open again," the Alpine nation's air traffic control service Skyguide said on Twitter, adding "the technical malfunction at Skyguide has been resolved".
It did not say what had caused the problem that shut Swiss airspace for hours Wednesday morning, but said that "air traffic over Switzerland and operations at the national airports of Geneva and Zurich are resuming".
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Those airports too announced that flights had begun taking off.
"Good news! Air traffic has gradually resumed since 8:30am (0630 GMT)," Geneva airport said in a tweet, warning that a number of flights had been cancelled and urging passengers to check with their airlines.
Zurich airport also said flight operations were "running again" at full capacity by 10:00 am (0800 GMT).
But it warned that "delays are to be expected today. We still recommend passengers to check with their airline about the status of their flight."
Agence France-Presse