On Tuesday, all flights at Heathrow Airport in London experienced cancellations and delays due to a significant technical issue affecting their air traffic control services. The disruption lasted several hours and led to a cascade of flight repercussions globally.
The technical difficulties, reported by NATS, the air traffic control service provider at Heathrow, began around 9 a.m. ET. NATS initially communicated via social media, stating that they were investigating an issue that was causing disruptions to flight departures.
As the situation progressed, Heathrow Airport staff updated the public through their social media channels, indicating that both arrivals and departures were impacted. They urged travelers to verify their flight statuses with their airlines and advised against heading to the airport unless their flights were confirmed.
The air traffic control service @NATS is experiencing a technical issue which is impacting arriving and departing flights across UK airports.
— Heathrow Airport (@HeathrowAirport) September 8, 2026
We are supporting our local NATS team in their efforts to resolve the issue as quickly as possible.
We apologise to those affected by pic.twitter.com/ji2LyCdL3T
By 2:30 p.m. ET, NATS officials announced that the technical issue had taken longer to resolve than initially anticipated but was eventually fixed. They emphasized their commitment to working diligently to clear the backlog of affected flights.
The cascading effects of the disruption were felt internationally, with numerous flights at Toronto Pearson International Airport canceled as a result of the situation at Heathrow. Travelers worldwide faced uncertainty and inconvenience due to the widespread delays and cancellations stemming from the technical difficulties.
Authorities at Heathrow and NATS are now focused on managing the aftermath, rectifying flight schedules, and ensuring that affected passengers are accommodated as efficiently as possible. Travelers are reminded to remain informed about their flight statuses as the situation evolves.
More updates will follow as the situation develops.
