Guardian counts 'hundreds of thousands' hit and presses ministers' questions; Independent counts 'thousands of flights' and leads on the Nats apology
National Air Traffic Services blames a software defect for last week's UK air traffic failure. Two outlets agree on the cause. They measure the damage differently and give the floor to different people.
The cause. The Guardian and The Independent both report that National Air Traffic Services (Nats) blames a software defect. That is Nats' own account. Neither report we hold says anyone has checked it independently.
Where they part.
| The Guardian | The Independent | |
|---|---|---|
| Scale | "hundreds of thousands" of people | "thousands of flights" |
| Length | six-hour outage | not given |
| Timings | error at 10am, major incident declared 12.30pm | not given |
| Voice | ministers: questions unanswered | Nats chief Martin Rolfe: "At no point was safety in question" |
The two scale figures count different things: people and flights. They do not contradict each other.
The gap. The Guardian cites the Nats report. It says the error first occurred at 10am but a major incident was not declared until 12.30pm. Ministers say they need "to urgently understand why this issue was not discovered and fixed before it caused chaos".
The apology. The Independent says Rolfe apologised for the defect. The part of its report we could read does not quote ministers.
What is not settled. - Why the defect was not found before it failed. Ministers say they do not know. - The exact number of passengers and flights. Neither report gives one. - The timings and the six-hour length come from The Guardian alone. - A second Independent report, a news bulletin, reached us as a headline only. We could not read how it framed the story.
What this is about. A computer fault at the body that guides aircraft through UK airspace stopped flights across the country last week. The body's own report on why has now been published.
How it got here. National Air Traffic Services, known as Nats, was separated from the Civil Aviation Authority and part-privatised in 2001. Since then it has been run as a public-private partnership. The government keeps a stake, and airlines and other shareholders hold the rest. Nats handles aircraft flying over the UK and runs the control towers at many of its airports. When its systems cannot process flight plans, controllers have to accept fewer aircraft. Flights are then held on the ground or cancelled.
The Guardian says that is what happened last week. It reports a six-hour outage and mass cancellations and delays. Nats has now published its report. The report blames a software defect that corrupted flight data "in the space of a millisecond".
Who is involved. - Nats runs the system and wrote the report. Its chief executive is Martin Rolfe. - Ministers answer for the government's stake and for transport policy. They say the report leaves questions open. - The Civil Aviation Authority is the UK's independent aviation regulator. It regulates Nats. - Airlines and passengers bore the cancellations and delays.
What is at stake. Whether one software fault can halt UK air travel again. If ministers decide the defect should have been caught, pressure will grow on how Nats tests its systems and how quickly it declares a failure. If the report satisfies them, the outage will be treated as a rare fault.
Where it stands. Nats has published its report and apologised. Ministers say they still need to understand why the fault was not found earlier. The reports we hold do not say what happens next.
What is being argued about
- A software defect named by Nats as the cause
- Two and a half hours between the first error and a major incident, according to The Guardian
- Ministers' questions set against the Nats chief's apology
- People affected or flights grounded
One cause, two accountsSide by side
| Outlet | Scale it gives | Who it quotes | Timings given? |
|---|---|---|---|
| The Guardian | "hundreds of thousands" of people; a six-hour outage | Ministers: the report "still left questions unanswered" | Yes: error at 10am, major incident at 12.30pm |
| The Independent | "thousands of flights" | Nats chief Martin Rolfe: "At no point was safety in question" | No |
Both outlets take the cause from the Nats report.
Sources
The Guardian
The Guardian
🇬🇧UK ·
newspaper · independent
Flight chaos for hundreds of thousands was caused in ‘millisecond’ by software error
Open this report in The AI Times →
Read it at The Guardian →
What we have measured
Actor named Denial in the passive voice, with no one named as the person who dismissed it ×1Actor named names Israel as acting and states the death toll flat, with no source ×1Actor named Ireland named as the side that ended the conference ×1Allegation omitted the police statement is cut with an ellipsis where the other two reports carry the controlling or coercive behaviour allegation ×1
Outlet profile in The AI Times →
The Independent
The Independent
🇬🇧UK ·
digital · independent
‘Software defect’ was cause of travel chaos that grounded thousands of flights
Open this report in The AI Times →
Read it at The Independent →
What we have measured
Accused party response Russia's side is reported as no comment. ×1A company statement about itself, taken as a "reveals" rather than "says", for a company's account of its own product ×1A count stated flat four crimes is given as a settled number in the headline, with no court, charge or jurisdiction attached ×1Actor named No actor named for the cut-short or for the clashes ×1
Outlet profile in The AI Times →
The Guardian
Centre-left
estimate · not a score
The Guardian
🇬🇧UK ·
newspaper · independent
Flight chaos for hundreds of thousands was caused in ‘millisecond’ by software error
Open this report in The AI Times →
Read it at The Guardian →
What we have measured
Actor named Denial in the passive voice, with no one named as the person who dismissed it ×1Actor named names Israel as acting and states the death toll flat, with no source ×1Actor named Ireland named as the side that ended the conference ×1Allegation omitted the police statement is cut with an ellipsis where the other two reports carry the controlling or coercive behaviour allegation ×1
Outlet profile in The AI Times →
The Independent
Centre-left
estimate · not a score
The Independent
🇬🇧UK ·
digital · independent
‘Software defect’ was cause of travel chaos that grounded thousands of flights
Open this report in The AI Times →
Read it at The Independent →
What we have measured
Accused party response Russia's side is reported as no comment. ×1A company statement about itself, taken as a "reveals" rather than "says", for a company's account of its own product ×1A count stated flat four crimes is given as a settled number in the headline, with no court, charge or jurisdiction attached ×1Actor named No actor named for the cut-short or for the clashes ×1
Outlet profile in The AI Times →
What the Nats report says, according to The GuardianFacts
optional section
- A software defect corrupted flight data "in the space of a millisecond". The Guardian →
- The error first occurred at 10am. A major incident was not declared until 12.30pm. The Guardian →
- The outage lasted six hours. The Guardian →
These facts come from one outlet only.
Sources
The Guardian
The Guardian
🇬🇧UK ·
newspaper · independent
Flight chaos for hundreds of thousands was caused in ‘millisecond’ by software error
Open this report in The AI Times →
Read it at The Guardian →
What we have measured
Actor named Denial in the passive voice, with no one named as the person who dismissed it ×1Actor named names Israel as acting and states the death toll flat, with no source ×1Actor named Ireland named as the side that ended the conference ×1Allegation omitted the police statement is cut with an ellipsis where the other two reports carry the controlling or coercive behaviour allegation ×1
Outlet profile in The AI Times →
The Guardian
Centre-left
estimate · not a score
The Guardian
🇬🇧UK ·
newspaper · independent
Flight chaos for hundreds of thousands was caused in ‘millisecond’ by software error
Open this report in The AI Times →
Read it at The Guardian →
What we have measured
Actor named Denial in the passive voice, with no one named as the person who dismissed it ×1Actor named names Israel as acting and states the death toll flat, with no source ×1Actor named Ireland named as the side that ended the conference ×1Allegation omitted the police statement is cut with an ellipsis where the other two reports carry the controlling or coercive behaviour allegation ×1
Outlet profile in The AI Times →
The bias in this coverageBias
Ministers' questions or the operator's apology
One report leads with ministers saying questions remain. The other gives the floor to the operator's chief, who apologises and says safety was never in question. Only the first carries the two-and-a-half-hour gap before a major incident was declared.
1 reports quoting ministers
1 reports quoting the operator's chief
1 reports giving the time of the first error
1 reports whose body we could not read
Passengers or flights
One headline counts people, at hundreds of thousands. The other counts flights, at thousands. Neither text we hold gives an exact figure.
1 headlines counting people
1 headlines counting flights
Scored without the mastheads. Where the two passes differ, both are kept.
Sources
The Guardian
The Guardian
🇬🇧UK ·
newspaper · independent
Flight chaos for hundreds of thousands was caused in ‘millisecond’ by software error
Open this report in The AI Times →
Read it at The Guardian →
What we have measured
Actor named Denial in the passive voice, with no one named as the person who dismissed it ×1Actor named names Israel as acting and states the death toll flat, with no source ×1Actor named Ireland named as the side that ended the conference ×1Allegation omitted the police statement is cut with an ellipsis where the other two reports carry the controlling or coercive behaviour allegation ×1
Outlet profile in The AI Times →
The Independent
The Independent
🇬🇧UK ·
digital · independent
‘Software defect’ was cause of travel chaos that grounded thousands of flights
Open this report in The AI Times →
Read it at The Independent →
What we have measured
Accused party response Russia's side is reported as no comment. ×1A company statement about itself, taken as a "reveals" rather than "says", for a company's account of its own product ×1A count stated flat four crimes is given as a settled number in the headline, with no court, charge or jurisdiction attached ×1Actor named No actor named for the cut-short or for the clashes ×1
Outlet profile in The AI Times →
The Independent
The Independent
🇬🇧UK ·
digital · independent
Bulletin PM briefing: UK ‘unprepared’ for drone threat and cause of flight chaos
Open this report in The AI Times →
Read it at The Independent →
What we have measured
Accused party response Russia's side is reported as no comment. ×1A company statement about itself, taken as a "reveals" rather than "says", for a company's account of its own product ×1A count stated flat four crimes is given as a settled number in the headline, with no court, charge or jurisdiction attached ×1Actor named No actor named for the cut-short or for the clashes ×1
Outlet profile in The AI Times →
The Guardian
Centre-left
estimate · not a score
The Guardian
🇬🇧UK ·
newspaper · independent
Flight chaos for hundreds of thousands was caused in ‘millisecond’ by software error
Open this report in The AI Times →
Read it at The Guardian →
What we have measured
Actor named Denial in the passive voice, with no one named as the person who dismissed it ×1Actor named names Israel as acting and states the death toll flat, with no source ×1Actor named Ireland named as the side that ended the conference ×1Allegation omitted the police statement is cut with an ellipsis where the other two reports carry the controlling or coercive behaviour allegation ×1
Outlet profile in The AI Times →
The Independent
Centre-left
estimate · not a score
The Independent
🇬🇧UK ·
digital · independent
‘Software defect’ was cause of travel chaos that grounded thousands of flights
Open this report in The AI Times →
Read it at The Independent →
What we have measured
Accused party response Russia's side is reported as no comment. ×1A company statement about itself, taken as a "reveals" rather than "says", for a company's account of its own product ×1A count stated flat four crimes is given as a settled number in the headline, with no court, charge or jurisdiction attached ×1Actor named No actor named for the cut-short or for the clashes ×1
Outlet profile in The AI Times →
The Independent
Centre-left
estimate · not a score
The Independent
🇬🇧UK ·
digital · independent
Bulletin PM briefing: UK ‘unprepared’ for drone threat and cause of flight chaos
Open this report in The AI Times →
Read it at The Independent →
What we have measured
Accused party response Russia's side is reported as no comment. ×1A company statement about itself, taken as a "reveals" rather than "says", for a company's account of its own product ×1A count stated flat four crimes is given as a settled number in the headline, with no court, charge or jurisdiction attached ×1Actor named No actor named for the cut-short or for the clashes ×1
Outlet profile in The AI Times →
Claims and verdicts
No claims registered.
Who wrote it
R
Rom Preston-Ellis
The Independent
The Independent
What the bias passes found in their reporting
Single label for several parties
"Nationalists" stands in for Scottish, Welsh and Irish positions that differ×1
What is placed beside what
the constitutional story shares its headline with a stadium tour, and the report carries no text×1
Claims we checked that rest on their reporting
1 unverified
From 52 reports we hold under this byline, at
The Independent. Two independent readings, each made without the masthead, a quote attached to every tag. A record, never a rating.
Their full record →
G
Gwyn Topham
The Guardian
The Guardian
What the bias passes found in their reporting
Lead choice
standfirst leads on the two-and-a-half-hour gap before the incident was declared×1
Measure choice
scale counted in people affected×1
Measure of scale
counts people affected: 'hundreds of thousands'×1
Timing detail
the only report we hold that dates the delay between the fault and the declaration of a major incident×1
Claims we checked that rest on their reporting
1 false1 disputed1 true
From 30 reports we hold under this byline, at
The Guardian. Two independent readings, each made without the masthead, a quote attached to every tag. A record, never a rating.
Their full record →
A
Amelia Neath
The Independent
The Independent
What the bias passes found in their reporting
Headline states what body hedges
The headline calls it a hijacking flat; the body says the co-pilot only may have attempted one×1
Headline vs body
The headline calls it a hijacking outright. The body hedges it as a possible attempt.×1
Hedge
The report says the motive is unknown, in the same piece whose headline names a hijacking×1
Hedge in body
Hijack and crash intent stated as possibility×1
Claims we checked that rest on their reporting
2 unverified1 true
From 119 reports we hold under this byline, at
The Independent. Two independent readings, each made without the masthead, a quote attached to every tag. A record, never a rating.
Their full record →
The bylines on the reports this story is built from. Hover one for what our passes have measured on their reporting.
Coverage, outlet by outlet
The Independent
Centre-left
estimate · not a score
The Independent
🇬🇧UK ·
digital · independent
Bulletin PM briefing: UK ‘unprepared’ for drone threat and cause of flight chaos
Open this report in The AI Times →
Read it at The Independent →
What we have measured
Accused party response Russia's side is reported as no comment. ×1A company statement about itself, taken as a "reveals" rather than "says", for a company's account of its own product ×1A count stated flat four crimes is given as a settled number in the headline, with no court, charge or jurisdiction attached ×1Actor named No actor named for the cut-short or for the clashes ×1
Outlet profile in The AI Times →
— independentRead it at The Independent →
https://www.independent.co.uk/bulletin/news/bulletin-pm-briefing-friday…
The Guardian
Centre-left
estimate · not a score
The Guardian
🇬🇧UK ·
newspaper · independent
Flight chaos for hundreds of thousands was caused in ‘millisecond’ by software error
Open this report in The AI Times →
Read it at The Guardian →
What we have measured
Actor named Denial in the passive voice, with no one named as the person who dismissed it ×1Actor named names Israel as acting and states the death toll flat, with no source ×1Actor named Ireland named as the side that ended the conference ×1Allegation omitted the police statement is cut with an ellipsis where the other two reports carry the controlling or coercive behaviour allegation ×1
Outlet profile in The AI Times →
— independentThe only report we hold with timings: the error at 10am, the major incident at 12.30pm and a six-hour outage. It also carries ministers' demand to know why the defect was not caught.
Error first occurred at 10am but major incident was not declared until 12.30pm, says report A software defect in part of the UK’s air traffic control system corrupted flight data “in the space of a millisecond”, leading to a six-hour outage and mass airline cancellations and delays across the UK last week, National Air Traffic Services has said. But ministers said the Nats report into the incident still left questions unanswered, saying they needed “to urgently understand why this issue was not discovered and fixed before it caused chaos”.
Measure of scale: counts people affected: 'hundreds of thousands' — “Flight chaos for hundreds of thousands was caused in ‘millisecond’ by software error”
Whose voice is quoted: quotes ministers questioning the operator — “to urgently understand why this issue was not discovered and fixed before it caused chaos”
Timing detail: the only report we hold that dates the delay between the fault and the declaration of a major incident — “Error first occurred at 10am but major incident was not declared until 12.30pm, says report”
Measure choice: scale counted in people affected — “Flight chaos for hundreds of thousands”
Voice quoted: ministers' challenge quoted alongside the operator's finding — “ministers said the Nats report into the incident still left questions unanswered”
Lead choice: standfirst leads on the two-and-a-half-hour gap before the incident was declared — “Error first occurred at 10am but major incident was not declared until 12.30pm, says report”
Read it at The Guardian →
https://www.theguardian.com/world/2026/sep/18/flight-chaos-affecting-hu…
The Independent
Centre-left
estimate · not a score
The Independent
🇬🇧UK ·
digital · independent
‘Software defect’ was cause of travel chaos that grounded thousands of flights
Open this report in The AI Times →
Read it at The Independent →
What we have measured
Accused party response Russia's side is reported as no comment. ×1A company statement about itself, taken as a "reveals" rather than "says", for a company's account of its own product ×1A count stated flat four crimes is given as a settled number in the headline, with no court, charge or jurisdiction attached ×1Actor named No actor named for the cut-short or for the clashes ×1
Outlet profile in The AI Times →
— independentThe only report we hold that quotes the Nats chief, Martin Rolfe. He apologises and says safety was never in question.
Travel News & Advice ‘Software defect’ was cause of travel chaos that grounded thousands of flights ‘At no point was safety in question’ Nats chief Martin Rolfe says as he apologises for the software defect that disrupted thousands of flights Amelia Neath Friday 18 September 2026 15:04 BST Bookmark Comments Go to comments Bookmark popover Removed from bookmarks Close popover Flights grounded at UK airports including Heathrow due to air traffic control glitch Your support helps us to tell the story Read more Support Now From reproductive rights to climate change to Big Tech, The Independent is
Measure of scale: counts flights: 'thousands of flights' — “‘Software defect’ was cause of travel chaos that grounded thousands of flights”
Whose voice is quoted: quotes only the operator's chief executive, apologising and reassuring on safety — “At no point was safety in question”
Measure choice: scale counted in flights — “grounded thousands of flights”
Voice quoted: only voice is the operator's chief, on safety and apology; no government questions — “‘At no point was safety in question’ Nats chief Martin Rolfe says as he apologises for the software defect”
Read it at The Independent →
https://www.independent.co.uk/travel/news-and-advice/uk-air-traffic-rep…
Checked, didn’t cover
T
The Irish Times
Centre
estimate · not a score
The Irish Times
🇮🇪IE ·
digital ·
What we have measured
Actor framing The release is framed as a joint agreement, with no pressure mentioned ×1Actor named Names the residents as the ones who blocked the road ×1Actor named killers named as 'loyalist gunmen'; verb 'shot dead' ×1With no actor named construction no actor named for the theft or the driving in the standfirst ×1
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R
RNZ
Centre
estimate · not a score
RNZ
🇳🇿NZ ·
digital · PUBLIC
What we have measured
Headline against body headline claims a 20-year decline reversed; the first line of the body reports a new low in reading ×1Headline against body headline claims a turnaround; the text carries a record low and puts it on boys ×1
Outlet profile in The AI Times →
R
RTÉ News
Centre
estimate · not a score
RTÉ News
🇮🇪IE ·
digital · PUBLIC
What we have measured
Abstraction as the actor the dispute acts and no one in it is named ×1Account taken as default the police description of the crowd as 'hostile' is carried with no other account ×1Accuracy the Slovenia entry in the country list repeats Austria's name ×1Active voice offender Donaldson is named as the one who did the abuse, in the active voice. ×1
Outlet profile in The AI Times →
ABC News (Australia)
Centre
estimate · not a score
ABC News (Australia)
🇦🇺AU ·
public broadcaster · public-service
What we have measured
Actor label and hedge The same man is called 'far-right' and named by his legal name. The act is hedged with 'allegedly', where the longer report states it flat. ×1A different count, stated flat one dead and 140 missing, unattributed, earliest of the four ×1Affected counted The only report to count the local people affected ×1Are the dead named one of the dead named, through a relative at the hospital ×1
Outlet profile in The AI Times →
C
CBC News
Centre-left
estimate · not a score
CBC News
🇨🇦CA ·
public broadcaster · public-service
What we have measured
Asserted vs attributed the measure is attributed to the three governments; the territory is called occupied in the outlet's own voice ×1Attribution kept in the headline the sourcing travels with the claim into the headline ×1Figure rounded in the headline more than 600 in the headline; the body sources it to a flight-tracking site ×1How the sourcing is hedged the claim is hedged to an unnamed newspaper in both headline and body; the reporting is not held by this report ×1
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Silence is recorded, not inferred — each of these was read when we built this story
and carried nothing on this event.
We could not read these
BBC News
Centre
estimate · not a score
BBC News
🇬🇧UK ·
public broadcaster · public-service
What we have measured
Dating and attribution 'It was not until Tuesday' is a judgement about delay, not a date. No other report we hold comments on how long the German finding took. ×1How hard the claim is stated Headline says the UN voted to adopt and replace; the last sentence of the report says the vote is non-binding ×1How hard the claim is stated The qualification arrives in the last sentence and is immediately overridden by an effect the report gives no source for. ×1Which figure is used States the replacement as done — the Assembly voted to replace the map — where the resolution urges states to use a different projection. ×1
Outlet profile in The AI Times →
The Daily Telegraph
Right
estimate · not a score
The Daily Telegraph
🇬🇧UK ·
newspaper · independent
What we have measured
Outlet profile in The AI Times →
The Times
Centre-right
estimate · not a score
The Times
🇬🇧UK ·
newspaper · independent
What we have measured
Outlet profile in The AI Times →
These are must-cite outlets for this desk that we did not manage to read
when we built this story. That is a gap in our reach, not a silence on their part, and
it is not evidence of anything about this story.