“The cancelled flights will affect 27,000 passengers,” the spokesman added.

European airlines have struggled this summer with the fallout of strikes, causing delays across the continent.

Budget carrier Ryanair said it was forced to cancel multiple flights in July tied to French air traffic control strikes.

KLM reached an agreement with some labour unions last week, but ongoing labor disputes on a collective agreement continue as the two unions that were not part of the deal said they would move forward with strike action.

A two-hour strike by ground staff is planned tomorrow morning, followed by a four-hour strike next Wednesday, Sept 17, also in the morning.

Flight cancellations can have knock-on effects for the entire flight schedule, causing delays and challenges for the aviation system.