Flights from British airports resumed on Wednesday after a major air traffic failure, but questions mounted about ‌the reliability of Britain's aviation systems and ministers called in the flight control boss to explain the shutdown.

The hours-long outage on Tuesday, which resulted in the cancellation of more than 1,000 flights and left hundreds of thousands of passengers stranded, has ramped up pressure on air traffic control provider NATS and ​its boss Martin Rolfe.

Transport minister Heidi Alexander will later on Wednesday hear from Rolfe after she summoned him to ​explain what happened, amid concerns that the infrastructure and technology are not up to scratch.

The shutdown ⁠comes three years after the last system meltdown in August 2023, when cancelled flights on one of the busiest travel ​days of the year cost airlines £100 million ($135 million).

A radar-related technical issue also disrupted flights in July 2025, affecting major airports including Britain's largest, ​Heathrow.

"I am seeking assurances that lessons will be learned and systems that support aviation are up to the job," Alexander said on X.

NATS BOSS UNDER PRESSURE

Ryanair, Europe's biggest airline, has been calling for Rolfe to resign since 2023, while Wizz Air's UK managing director also said he should ​consider his position.

Ryanair said Britain's airspace underperformed other countries.

"We've had minor issues in other places, but nothing at the scale that ​we see, and consistently see, in the UK," Ryanair's chief operating officer Neal McMahon told the BBC.

Rolfe, who apologised to those affected by the ‌issue, ⁠denied that Britain was worse than other countries and said the country's air traffic service was well regarded from a safety and resilience perspective.

"We have, at this point, ruled out cyber(attacks)," Rolfe told the BBC when asked about the cause, adding he believed it would be different to previous outages.

As operations restarted, Heathrow said passengers should check with their airline before heading to the airport ​as schedules would have changed ​due to the problems on ⁠Tuesday.

"We are expecting knock-on impacts as aircraft and crew reposition," the UK's busiest hub said in a statement.

"We... are working closely with our local NATS team and airline partners to recover normal ​operations as quickly as possible."

London Gatwick, Britain's second busiest airport, and the city's Luton and ​Stansted also said ⁠they were operating but told passengers to check with their airline first.

Ryanair said around 150,000 of its passengers had been affected on Tuesday and it cancelled more than 200 flights, while British Airways said it had cancelled or diverted 100 flights with tens of ⁠thousands impacted.

NATS ​is a public-private partnership which is partially owned by airlines including British Airways ​and easyJet, pension funds and the government.

Criticising the £175 million of dividends NATS paid to its owners last year, Ryanair's McMahon said NATS should reinvest its profits ​into technology and boost its staff numbers.