WARSAW (REUTERS)
An outage affecting Poland's air traffic management system led to widespread delays on Saturday, a spokesman for the Polish Air Navigation Services Agency (PANSA) confirmed to the PAP news agency.
While a backup system was available, air traffic still had to be temporarily restricted at the height of the summer holiday season, he said.
The restrictions applied to flights at a number of Polish airports.
The spokesman said the cause was being investigated, but that the situation was under control.
Media reports said there were cancellations at various airports, with travellers told to prepare for delays.
Warsaw's main airport had earlier reported disruptions to aircraft takeoffs, according to state news agency PAP, but later said planes were departing.
"Takeoff and landing operations at Chopin Airport have been fully restored and are now proceeding without disruptions," Chopin Airport in Warsaw wrote on X.