Staffing shortages at Amsterdam Schiphol continue to impact airlines that were asked to cancel their flights for eight hours on September 12 due to a lack of adequate security personnel.

“After weeks of improvement, Schiphol did not expect to have to take these measures again,” the airport said in a statement, warning that travellers could face long waiting times again.

Schiphol said airlines that heeded the request would be compensated, as well as travellers who missed their flight due to long queues.

The airport asked airlines to cancel all flights between 1600L and 2300L (1800Z and 0100Z) on September 12. According to Radarbox ADS-B data, KLM Royal Dutch Airlines was forced to cancel almost 60 flights in those seven hours. More than 20 other airlines were affected, including Transavia Airlines, Qatar Airways, Turkish Airlines, Pegasus Airlines, easyJet, Air Malta, TUI fly (Germany), Lufthansa, TAP Air Portugal, SAS Scandinavian Airlines, Austrian Airlines, flybe., Vueling Airlines, Royal Air Maroc, ITA - Italia Trasporto Aereo, British Airways, airBaltic, Norwegian Air Sweden, Finnair, Ryanair, and LOT Polish Airlines.

Travel at Schiphol has been disrupted since April, with passengers queuing for hours and delayed luggage becoming a common sight.