An airport worker seen Monday manually writing a bording pass in Brussels, Belgium after Saturday's cyber-attack left many European airports in virtual darkness. On Wednesday,s London's Heathrow said it was "operating as normal." Photo by Olivier Matthys/EPA

Sept. 24 (UPI) -- British authorities on Wednesday announced the arrest of a man in connection with cyberattacks that led to days of flight delays at some of Europe's busiest airports.

Britain's National Crime Agency said on Tuesday evening an unidentified West Sussex man in his 40s was arrested "as part of an investigation into a cyber incident impacting Collins Aerospace," which is a division of Virginia-headquartered defense contractor RTX.

The chief of Britain's NCA said Wednesday that although the arrest was a "positive step," the investigation was still "in its early stages and remains ongoing."

On Saturday, a cyberattack plunged European air passengers into virtual darkness as chaos ensued in a non-isolated incident with criminal gangs deploying ransomware to disrupt check-ins, boarding systems and other airport IT around the globe.