Finnish national airline Finnair cancelled about 100 flights Friday due to a strike by a labour union that organizes ground staff at the country's main airports.
The cancellations affected an estimated 6,500 passengers. Finnair said it was not party to the dispute between the Finnish Aviation Union and the service sector employers' association Palta.
A week ago, the union staged a similar strike that affected security checks, check-in and gate services, and baggage handling.
Friday's four-hour labour action affected employees of ground-staff handling company Airpro Oy, including the main Helsinki Airport. The strike was called between 3 pm and 7 pm (1300-1700 GMT), and affected most domestic flights and many European flights during that time period but also earlier flights.
The union this week rejected a bid presented by the national arbitrator on a collective bargaining agreement that other unions have signed on to.
Finnair advised passengers to update their contact information, and said they should be aware that meals onboard were limited. Passengers were also advised to travel only with hand luggage.
Airport operator Finavia said passengers should prepare for longer waiting times.