A one-day strike by workers at 13 German airports, including the Frankfurt and Munich hubs and all the country’s other main destinations, caused the cancelation of most flights on Monday, writes The Independent.

The 24-hour walkout, which started at midnight, involves public-sector employees at the airports as well as ground and security staff. At Frankfurt Airport, 1,054 of the day’s 1,116 scheduled takeoffs and landings had been canceled, German news agency dpa reported, citing airport traffic management.

All of Berlin Airport’s regular departures and arrivals were canceled, while Hamburg Airport said no departures would be possible. Cologne/Bonn Airport said there was no regular passenger service and Munich Airport advised travelers to expect a “greatly reduced flight schedule”.

The ver.di service workers union’s strike also targeted the Hamburg, Bremen, Hannover, Berlin, Duesseldorf, Dortmund, Cologne/Bonn, Leipzig/Halle, Stuttgart and Munich airports. At the smaller Weeze and Karlsruhe/Baden-Baden airports, only security workers were called out.