The association of Germany's airport operators estimated Monday's strike effect to be substantial, stating more than half of Germany's typical 6,000 daily flights were facing cancellation, with some 3,400 flights set to be grounded, leaving more than 510,000 passengers stranded.

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

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.