A look at some of the disruptions affecting airlines and airports around the world:
Germany: Eurowings said it had to cancel its domestic flights in Germany and services to and from the UK on Friday. The Lufthansa subsidiary said check-in and boarding were disrupted by a computer outage. The airline urged passengers travelling within Germany to book and present a train ticket for compensation.
SOUTH KOREA: Several budget airlines reported problems, causing delays to boarding passengers at Incheon International Airport, the country’s largest airport. Jeju Air said it was experiencing problems with ticket bookings and other services on its website. Air Primea said key services on its website, such as ticket bookings, cancellations and online check-in, were not working. Eastar Jet’s website was unavailable as of early Friday evening.
United States: United Airlines said the outage affected its computer systems and warned customers of possible flight delays. The company said some flights had resumed and it was issuing waivers to make it easier to change travel plans on its website.