LONDON – Thousands of passengers were delayed, diverted or stuck on planes Thursday as the only runway at Britain’s Gatwick Airport remained closed into a second day after drones were spotted over the airfield.

The airport south of London – Britain’s second-busiest by passenger numbers – closed its runway Wednesday evening after two drones were spotted. It reopened briefly at about 3 a.m. Thursday, but shut 45 minutes later after further sightings.

The airport said all incoming and outgoing flights were suspended. Passengers were advised to check the status of their flights before heading to the airport, where many slept on floors or formed long lines at information desks.

Chris Woodroofe, Gatwick’s chief operating officer, said that roughly 10,000 people had been affected by the shutdown by Thursday morning, including 2,000 whose planes were unable to take off from Gatwick, 2,000 stuck at their points of origin and 6,000 diverted to other airports in Britain, as well as Paris and Amsterdam.

Those numbers are expected to rise sharply. More than 100,000 passengers had been scheduled to pass through Gatwick on Thursday on 760 arriving and departing flights.

Woodroofe said at least one drone remained in the area Thursday morning.

“As I stand here, there is a drone on my airfield as we speak,” Woodroofe told Sky News.

A police helicopter was hovering near the airfield as officers from two nearby forces hunted the drone operators.

“The police advice is that it would be dangerous to seek to shoot the drone down because of what may happen to the stray bullets,” Woodroofe said.

Any problem at Gatwick causes a ripple effect throughout Britain and continental Europe, particularly during a holiday period when air traffic control systems are under strain.

Passengers complained on Twitter that their Gatwick-bound flights had landed at London Heathrow, Manchester, Birmingham and other cities.

Luke McComiskie, who landed in Manchester – more than 160 miles from London – said the situation “was just chaos, and they had only two coaches (buses) and taxis charging people 600 pounds ($760) to get to Gatwick.”

Gatwick, about 30 miles south of London, sees more than 43 million passengers a year to short- and long-haul destinations and serves as a major hub for the budget carrier easyJet.

Gatwick normally operates throughout the night but the number of flights is restricted because of noise limitations. The airport website says it usually handles 18 to 20 flights overnight during the winter months.

Gatwick briefly closed its runway last year when a drone was spotted in the area.

Pilots have reported numerous near-misses with drones in recent years in Britain, and aviation authorities have warned there is a growing risk that a midair collision could cause a major disaster.

Strong sales of small consumer drones have led to repeated warnings about a possible threat to commercial aviation.

Flying a drone near an airport carries a maximum penalty of five years in prison.

Christopher Lister, whose flight from Kiev, Ukraine, to Gatwick was diverted to Birmingham in central England, said the scale of the disruption was “a little bit scary.”

“We feel grateful it’s not a worse story this morning about an aircraft (that has) come down,” he told the BBC.

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