Update....Lufthansa has canceled 520 flights scheduled for today, with at least 58,000 passengers expected to be affected as cabin crew went on their longest-ever strike in a 2 year-long pensions dispute. Cabin staff joined the strike for the first time. The Independent Flight Attendants Organization (UFO) plans to stage walkouts over the course of the next six days.

Strikes by pilots have already cost Lufthansa 130 million euros so far this year. Equinet analyst Jochen Rothenbacher told Reuters that walkout costs could total 20 million euros ($21 million) a day, depending on the number of cancellations. Should the union strike for seven days, as promised, it could cost the company 140 million euros.

All European and domestic services have been scrapped, with the exception of some flights between MUN and FRA, as well as three Frankfurt-London Heathrow links. No intercontinental flights will be hit, however, the airline said, with the exception of one connection between DUS and EWR.