UK airports warn of more disruption after air traffic control recovery runs longer than expected

Major airports across the United Kingdom warned of further disruption on Tuesday after a technical fault at air traffic control provider Nats triggered widespread delays and cancellations and then took longer than expected to recover. The problem affected departing flights at several busy airports, including Heathrow and Gatwick, and quickly rippled through the wider network.

Nats said the issue was in its flight processing system and initially told passengers that it was investigating a technical problem causing some disruption to departures. By later in the day, the provider said the fault had been fixed and normal operations were resuming, but added that recovery was taking longer than hoped. Airports advised travelers to check with their airlines before heading to the terminal.

The disruption came during a period of heavy summer travel, when even a short air traffic control failure can cascade across a national network. Flights were delayed or canceled at airports beyond London as airlines worked to reposition aircraft, crews and passengers affected by the stoppage.

Knock-on impact across the network

Heathrow said the technical issue at Nats was affecting arriving and departing flights, while other airports including London City, Manchester, Stansted, East Midlands and Birmingham also reported delays or disruption. In some cases, airlines warned passengers that flights could be pushed back by hours as schedules were reshuffled.

The incident renewed scrutiny of the resilience of Britain’s aviation systems, particularly the software and contingency arrangements used to manage departures. Nats said it was working to restore normal operations as quickly as possible and apologized for the disruption caused to travelers.

The latest setback follows other recent air traffic control incidents that have caused major knock-on effects for UK passengers, underscoring how dependent airport operations are on the smooth functioning of centralized flight-processing systems. As the recovery continued, airports said the length of the disruption would depend on how quickly airlines and controllers could clear the backlog of delayed services.