The Norwegian airline Wideroe says its cabin crew has gone on strike after labor negotiations broke down, grounding all aircraft and stranding 11,000 passengers in Norway and northern Europe.

The airline says 312 flight attendants went on strike Wednesday to get their pension program in line with Wideroe's pilots, who are able to determine their own pension schemes.

Wideroe flies to 47 airports in Norway, the U.K., Sweden and Denmark.

The airline also said the strike could pose a life-threatening danger to people in rural Norway who depend on the airline to get to a hospital.

Scandinavian airline group SAS AB last week announced it would sell Wideroe to a group of Norwegian investors.