More than 670 flights will be cancelled during the day, according to the company. And some 170,000 passengers will be affected over the weekend.
On Thursday, SAS began offering to re-book passengers onto other flights, run by other airlines. In a statement, the airline said updates will be sent to passengers via email and text messages, and that travelers should check the status of their flight online before heading to the airport.
The disagreement is over pay as well as matters of principle. The union feels that they are owed compensation for helping to save SAS back in 2012, when the company was on the brink of bankruptcy and pilots accepted a pay cut. Now, they say, they are among the lowest paid in Europe.
But SAS tells Swedish Radio that the union's demands are unreasonably high and would threaten the company's long-term competitiveness.