Ten planes and around 1,400 passengers of Polish airliner LOT were grounded Sunday after a major hacking attack jammed the carrier's systems, the company confirmed.
LOT's computer system suffered an attack on Sunday afternoon which left it unable to send flight plans to the aircraft before takeoff. Without this document—which details the route, weather and other important information—the planes were not able to fly, LOT spokesperson Adrian Kubicki told CNBC by phone.
The issue, which took five hours to solve, meant that 10 flights were cancelled and around 15 were delayed at Warsaw Chopin airport.
Kubicki said the hackers carried out a so-called distributed denial of service (DDoS) attack which overwhelms a network with traffic, but the motive was unclear.