In December, an industrial action in France (14 December) impacted operations in Marseille, Brest, Paris, Bordeaux , Reims, Barcelona, Madrid and Karlsruhe ACCs and at Paris Orly airport. There were staffing issues on 14, 16 and 21 December in Marseille, Budapest and Karlsruhe ACCs.
Weather conditions (strong winds/ low visibility) impacted Amsterdam Schiphol, Frankfurt, Lisbon, Vienna and Madrid and London Heathrow airports on 16 and 21 December.
Unauthorized drones in the vicinity of London Gatwick airport generated high delays. The airport was unavailable for flight operations on Wednesday 19 December until Friday 21 December. This resulted in 87 diversions and the cancellation of approximately 770 flights.
On 22 December, ATC staffing issues were observed in Bordeaux and Maastricht ACCs and strong winds impacted Amsterdam Schiphol and London Heathrow airports. A volcanic eruption of Etna from 24 until 26 December generated delays at Catania airport.