What Exactly Caused the Disruption?
The chaos began around midday on Tuesday, September 8, when a technical fault hit the flight processing system of National Air Traffic Services (NATS), the UK's main air traffic control provider. This system is critical for safely managing the thousands
of flights that use UK airspace daily. While aircraft already in the air were handled safely, the system failure severely limited the ability to manage new departures. Engineers identified and applied a fix within several hours, but by then a massive backlog had already formed, leading to a domino effect of cancellations and delays that stretched for days. NATS has ruled out a cyberattack as the cause, but the government has demanded a full report within a week to explain the meltdown.
The Scale of the Chaos
The numbers paint a stark picture of the disruption. Over two days, more than 2,000 flights were cancelled, affecting major hubs like London's Heathrow and Gatwick, as well as Manchester and Birmingham. This impacted an estimated 330,000 to 700,000 passengers who found themselves stuck at airports, sleeping on floors, or scrambling for alternative travel and accommodation. The knock-on effects were felt across Europe and beyond, as planes and crew were left out of position, making a swift recovery impossible. Airlines, including British Airways and Ryanair, were forced to cancel hundreds of services each.
How Were Travellers from India Affected?
The UK-India corridor, one of the world's busiest long-haul routes, was significantly impacted. Multiple flights operated by Air India and IndiGo from cities like Delhi, Mumbai, and Bengaluru were diverted to other European airports such as Paris, Amsterdam, and Zurich on September 8. Consequently, their return journeys to India were cancelled the following day, leaving passengers stranded in transit. Reports showed that seven of the 24 daily flights from India to the UK were cancelled on Wednesday, September 9, highlighting the direct impact on travellers from the subcontinent. Passengers described scenes of chaos and a lack of information, with some, including Indian Rajya Sabha member Milind Deora, stuck in European airports for nearly a day.
What Happens Next?
While flight schedules began to normalise by Thursday, September 10, the incident has raised serious questions about the resilience of the UK's critical aviation infrastructure. This is the third major failure of its kind in just over three years, prompting angry calls from airline executives for the resignation of the NATS CEO and for urgent reforms. The UK's Transport Secretary has ordered an independent review by the Civil Aviation Authority (CAA) in addition to the NATS internal investigation. For affected passengers, the news on compensation is disappointing. The CAA has stated the outage is likely considered an 'extraordinary circumstance', meaning airlines are obligated to provide care and assistance like food and accommodation, but are unlikely to have to pay financial compensation for the delays and cancellations.
