Pull to refresh
Logo
NATS flight system failure grounds hundreds of flights at UK airports

NATS flight system failure grounds hundreds of flights at UK airports

Built World

Third major outage since 2023 renews scrutiny on air traffic control reliability

Yesterday: Third NATS failure grounds UK flights

Overview

Updated 56 minutes ago

A 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

400+
Flights cancelled at UK airports
According to flight tracking data from Flightradar24 and FlightAware as of Tuesday evening.
150,000
Ryanair passengers affected
Ryanair said its passengers faced delays of up to eight hours and that it cancelled more than 200 flights.
3
Major NATS outages since 2023
The 2023, 2025 and 2026 system failures each disrupted hundreds of thousands of passengers.
£100M+
Cost of 2023 outage to airlines
Airline bosses said the 2023 NATS failure cost them over £100 million in refunds and compensation.

Voices

Curated perspectives — historical figures and your fellow readers.

Ever wondered what historical figures would say about today's headlines?

Sign up to generate historical perspectives on this story.

Play

Exploring all sides of a story is often best achieved with Play.

Most of these play right now — no account needed. Sign up to save scores, keep a streak, and unlock Debate and Predict. Log in Sign Up
Predict 3 ways this could play out. Back the one you believe — contrarian picks score more when a scenario has a resolution date. Log in to play

People Involved

Organizations Involved

Timeline

August 2023 September 2026

5 events Latest: Yesterday
Tap a bar to jump to that date
  1. Third NATS failure grounds UK flights

    Latest System failure

    Flight processing failure at Swanwick halts departures at Heathrow, Gatwick, Manchester and ten other airports. Hundreds of flights cancelled.

  2. NATS implements fix, recovery begins

    Recovery

    NATS says engineers implemented a fix and the flight system is starting to recover, but warns recovery will take time.

  3. Second NATS meltdown

    System failure

    Another NATS failure disrupts hundreds of thousands of passengers; Ryanair calls for the chief executive's resignation.

  4. CAA orders contingency review

    Regulatory action

    Civil Aviation Authority tells NATS to review contingency plans after the 2023 flight plan processing malfunction.

  5. First major NATS failure

    System failure

    Faulty 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

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.

Then

Thousands of flights were disrupted and airlines faced a compensation bill exceeding £100 million.

Now

The CAA told NATS to overhaul contingency plans, yet a similar system failure recurred in 2025 and again in 2026.

Why this matters now

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.

2025

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.

Then

Operations eventually recovered, but the second failure deepened airline frustration with NATS.

Now

The recurrence demonstrated that the 2023 fix did not address a systemic reliability problem, leading to renewed regulatory scrutiny.

Why this matters now

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.

Sources

(10)