Flights to and from Sweden's main airports are set to resume after a computer glitch that grounded planes for hours at Stockholm and Gothenburg was fixed.
"The communications problem that affected air traffic during the day is now resolved and we are working to gradually increase capacity," the air traffic authority, LFV, said in a statement on Thursday.
Traffic at Stockholm's main airport, Arlanda, which handled 23.2 million passengers last year, was halted for several hours, as was that at the capital's second airport, Bromma, and Gothenburg's Landvetter.
Air traffic control officials at Bromma told Dagens Nyheter newspaper that the incident was not terrorism-related.
The state-owned railway company SJ said on Thursday that its booking system was down because of a technical problem.
Last year a solar flare brought down radar at the Stockholm and Gothenburg airports for several hours, delaying flights.