COPENHAGEN, Denmark_Scandinavian Airlines canceled more than 60 flights to and from Copenhagen on Tuesday after Danish cabin crew walked out on a wildcat strike, the airline said.
The cancellations affected some 6,000 passengers on European routes, SAS Denmark spokesman Mikkel Londahl said, adding it was not clear how long the strike would last.
"We cannot predict if or when they will return to work again so we can expect more cancellations," he said.
Cabin crew walked off their jobs shortly after 2:15 p.m. (1215GMT) in an apparent protest over working conditions.
Last month, members of the 1,600-strong Danish Cabin Attendants Union briefly went on a similar wildcat strike. A spokesman for the union did not immediately return calls seeking comment on the latest walkout.
Scandinavian Airlines is the joint flag carrier of Sweden, Denmark and Norway.
SAS called the strike "illegal" and said the Danish Cabin Attendants Union could face legal action if the crews do not return to work.
Scandinavian Airlines said it would cancel more than 280 flights on Tuesday after talks with union officials failed to end a strike by Swedish cabin crews.
1,200 departures have been cancelled and 90,000 passengers have been affected by Salaried Employees' Union strike
In Saturday's crash landing, a SAS turboprop slid down the runway on its belly when its landing gear collapsed after touchdown.