NATS flight system failure grounds hundreds of flights at UK airports
Built WorldThird major outage since 2023 renews scrutiny on air traffic control reliability
Yesterday: Third NATS failure grounds UK flightsNew here? Follow stories to track developments over time. Create a free account to get updates when stories you care about change.
Overview
Updated 56 minutes agoA mid-afternoon technical failure in NATS' flight processing system grounded departures across the UK on September 8. Heathrow, Gatwick, Manchester and ten other airports halted or restricted flights, leaving hundreds of planes cancelled and tens of thousands of passengers stranded.
This is the third major NATS outage since 2023, when a faulty flight plan file shut down the same system and cost airlines over £100 million. The Civil Aviation Authority told NATS to review its contingency plans in 2024, yet the failure recurred in 2025 and again on Tuesday. Ryanair is demanding the chief executive's resignation.
Why it matters
Every flight in UK airspace depends on NATS' flight processing system, which has now failed three times since 2023 without a durable fix.
Questions about this story
Free account needed to ask — your question is kept and asked for you right after sign-up. Answers are public.
No questions yet — be the first to ask.
Key Indicators
Voices
Curated perspectives — historical figures and your fellow readers.
Play
Exploring all sides of a story is often best achieved with Play.
Higher or Lower
A number from this story, against one from elsewhere in the news — guess which is bigger, then keep the chain going. 5 rounds, 3 strikes; a miss costs a strike and resets your streak.
Keyboard: ↓/L lower · ↑/H higher
0 points — sign up to put that on the leaderboard.
Connections
Sixteen names from the news. Find the four hidden groups of four. Four mistakes max.
Sign up to keep a daily streak — a new puzzle lands every day.
Exit debate?
Your progress in this debate will be lost.
- 1 Two AI personas square off on this story.
- 2 You predict who'll win each round — correct picks earn XP.
- 3 One crossfire question is yours to fire. Pick it carefully.
Couldn't generate a topic
Select Your Champions
Choose one persona for each side of the debate
DEBATE TOPIC
Choose personas with different perspectives for a more dynamic debate.
Select debater for this side:
No debate personas available right now.
Select debater for this side:
No debate personas available right now.
Who's Got This Round?
Make your prediction before the referee scores
The referee scores both sides on
Round Results
Set the Crossfire
Pick the question both personas must answer in the final round
Debate Oracle! You called every round!
Sharp Instincts! You know your debaters!
The Coin Flip Strategist! Perfectly balanced!
The Contrarian! Bold predictions!
Inverse Genius! Try betting the opposite next time!
XP Breakdown
Prediction History
People Involved
Organizations Involved
NATS provides air traffic control for UK airspace and the eastern Atlantic, operating from a control centre at Swanwick, Hampshire.
Europe's largest budget airline by passenger numbers, based in Dublin, Ireland.
The UK's independent aviation regulator, responsible for safety and reliability oversight of air traffic services.
The UK's flagship carrier and Heathrow's largest airline, operating from Terminal 5.
Timeline
August 2023 September 2026
-
Third NATS failure grounds UK flights
Latest System failureFlight processing failure at Swanwick halts departures at Heathrow, Gatwick, Manchester and ten other airports. Hundreds of flights cancelled.
-
NATS implements fix, recovery begins
RecoveryNATS says engineers implemented a fix and the flight system is starting to recover, but warns recovery will take time.
-
Second NATS meltdown
System failureAnother NATS failure disrupts hundreds of thousands of passengers; Ryanair calls for the chief executive's resignation.
-
CAA orders contingency review
Regulatory actionCivil Aviation Authority tells NATS to review contingency plans after the 2023 flight plan processing malfunction.
-
First major NATS failure
System failureFaulty flight plan file shuts down NATS' automatic processing system, disrupting UK airports and costing airlines over £100 million.
Historical Context
2 moments from history that rhyme with this story — and how they unfolded.
August 2023 NATS outage
A single corrupted flight plan file downed NATS' automatic flight plan processing system, triggering chaos across UK airports on a bank holiday Monday. The Civil Aviation Authority later said the company needed to review its contingency plans, and airline bosses said the outage cost them over £100 million in refunds and compensation.
Thousands of flights were disrupted and airlines faced a compensation bill exceeding £100 million.
The CAA told NATS to overhaul contingency plans, yet a similar system failure recurred in 2025 and again in 2026.
It was the first of three major NATS failures that followed the same pattern, raising the question of whether the company has durably fixed its systems or is applying patches.
Second NATS failure (2025)
NATS suffered another meltdown that disrupted hundreds of thousands of passengers, according to The Telegraph. Ryanair called for the chief executive's resignation then as well. The pattern of repeated failure set the stage for Tuesday's third outage.
Operations eventually recovered, but the second failure deepened airline frustration with NATS.
The recurrence demonstrated that the 2023 fix did not address a systemic reliability problem, leading to renewed regulatory scrutiny.
Shows the 2026 failure is not an isolated incident but part of a recurring pattern that has now prompted Ryanair to demand a leadership change.
