The first flights left Eindhoven airport in the Netherlands late Wednesday after a computer outage grounded planes for hours and hit government services, with authorities saying it was pinning the cause.
Planes were grounded for hours at the southeastern regional airport which normally takes passengers to 30 international destinations.
Earlier passengers were taken to other airports by bus amid chaotic scenes, the ANP national news agency reported.
"The first plane of today has just departed," Eindhoven Airport said on its website, but it advised passengers to continue to check flight schedules.
The country's main airport, Schiphol near Amsterdam, which is a major European hub, was unaffected.
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