The attack targeting Collins Aerospace technology caused chaos at airports across Europe and beyond. It began on September 19 and spilled into the working week. It impacted ARINC SelfServ cMUSE software used by airport workers to process traveler check-ins and bag drop functions. Airports caught up in the incident included London Heathrow, Berlin Brandenburg, and Brussels Airport, leading to hundreds of cancelled flights and extensive delays on both sides of the Atlantic.