Switzerland reopened its airspace on Wednesday morning, after a computer glitch had grounded flights across the Alpine nation for several hours.
"The technical malfunction at Skyguide has been resolved," the Swiss air traffic control service said in a tweet.
"The airspace closure was lifted at 8:30 am (0630 GMT)," it said. "Swiss airspace is now open again and air traffic over Switzerland and operations at the national airports of Geneva and Zurich are resuming."
Switzerland grounded flights at the Geneva and Zurich airports, and diverted four flights from Johannesburg, Dubai, Chicago and Montreal on Wednesday morning because of a technical problem.
Skyguide is an air navigation service provider that manages and monitors Swiss air space and is also responsible for air safety in the border regions of Germany, France, Italy and Austria.
Skyguide said it had “experienced a technical malfunction in the early hours of this morning", which is why Swiss air space was closed to traffic for safety reasons.
