Following a computer system hack on Sunday, some flights operated by Poland’s national airline, LOT, were grounded at Warsaw’s Chopin airport, the company said.
Around 1,400 passengers were stranded as 10 flights were cancelled and another 12 were delayed.
Company officials said the airline’s ground computer systems used to issue flight plans were attacked by hackers.
LOT spokesman Adrian Kubicki said that the computer system, which was hacked on Sunday afternoon, was fixed five hours later.
Adrian also said that no other ongoing flights as well as airports were affected and that flights scheduled for Warsaw were able to land safely.
“We’re using state-of-the-art computer systems, so this could potentially be a threat to others in the industry,” added Kubicki.
The airline made clear that the airport itself was not affected and the source of the hack is not yet known.