Short answer: A software issue at NATS caused flight cancellations and delays, costing the UK economy £33m. Airlines, airports, and tour operators were affected. Plan for extended traffic disruptions and regularly assess risks in critical systems.
TL;DR
- Software failure led to 1152 flight cancellations.
- Cost to UK economy was £33m ($44m).
- Airlines and airports experienced significant delays.
- NATS is using legacy systems, posing ongoing risks.
What happened?
The issue is a major software failure at NATS, the UK's air traffic control service. A defect in the software caused flight cancellations and delays, impacting airlines, airports, and tour operators. This event highlights the risks of relying on legacy systems and the need for better coordination and risk management in critical sectors.
Key facts
| Reported by | Infosecurity Magazine |
|---|---|
| Date reported | 05 Nov 2026 |
How it works
A software defect in NATS's legacy system caused a brief outage. At 10am, corrupted flight data appeared. By 12:45pm, all UK departures were halted due to a collision in the system.
- Corrupted flight data at 10am
- Routine request collision
- All UK departures stopped at 12:45pm
- Manual fallback procedures initiated
- Flight restrictions lasted until evening
Timeline
| Date | Event | Source |
|---|---|---|
| 2026-11-05 | Reported by Infosecurity Magazine | Infosecurity Magazine |
| 2026-11-12 | This Skillmate explainer published | Skillmate |
How to fix it
- Keep systems and network devices updated and follow vendor security notices.
- Make sure an incident response contact and plan exist before an attack happens.
- Ask your service providers which protections they offer, and test them.
How to detect it
Defenders should look for crashes, delays, and cancellations in flight data.
What is confirmed
- Reported by Infosecurity Magazine
Why it matters
This incident highlights the risk of relying on legacy systems. It cost the UK economy £33m, affecting 450,000 passengers. Companies must plan for multi-hour disruptions to minimize impact.
Learn the skills behind this story
Want to understand attacks like this and defend against them? Join Skillmate cybersecurity training or practise hands-on in Skillmate Labs.
FAQ
What was the main cause of the failure?
The failure was caused by a previously unknown defect in the legacy software of the National Airspace System (NAS).
How much did the failure cost the UK economy?
The failure cost the UK economy around £33 million, with a possible range up to £76 million.
How many passengers were affected?
Approximately 450,000 passengers were affected by cancellations or delays of more than two hours.
Sources
- NATS Air Traffic Control Failure Cost UK Economy £33m (Infosecurity Magazine)
How we wrote this: facts come from the sources above. An on-prem AI model drafted the plain-English parts and every sentence was checked against the sources; unsupported sentences were removed. MITRE mapping is our own judgement.
Watch today's video brief: https://youtu.be/yaK-CF987xg