Footage shows the terrifying damage drones can do to passenger planes after Gatwick Christmas chaos

GATWICK Airport has been in chaos after two illegal drones flew onto its runway.

With passengers stranded inside planes and flights diverted across the country, we take a look at exactly why drones can be so damaging to planes - and why the London airport must remain closed.

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Earlier this year, the tested the impact of drones on planes as part of their research.

In footage released from their crash tests, a small drone was shown flying into the wing of an aircraft.

It left a huge gaping hole before disintegrating into the wing - revealing just how damaging a drone collision could be.

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But this isn't the only issue.

If a drone is ingested by a plane's engine, there could be a problem too.

A spokesperson from the British Airline Pilots' Association told Sun Online Travel: "A drone striking a plane could cause catastrophic damage.

"We are most worried about a drone colliding with an aircraft's windshield as it could penetrate it.

"The fuselage, wings and nose of the plane can also be damaged severely by a drone."

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The spokesperson also said that aircraft need to be tested against drone collisions, which they aren't currently.

They said: "Aircraft have to be certified and tested against bird strikes - that's a requirement. Although we know that drones are more dangerous than birds, there is currently no requirements for planes to be tested against drone strikes.

"Whereas birds are heavy and soft, drones are heavy and hard and will cause much more damage.

"It's a matter of when, not if, a plane is catastrophically damaged by a drone."

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Meanwhile  reports: "While bird strikes are relatively frequent, and passenger aircraft are perfectly capable of flying with one engine out of action, there are concerns that a metallic object containing lithium batteries could cause an uncontained failure, with debris impacting on the airframe.

Festive holidaymakers at Gatwick have been warned to expect disruption for another 24 hours at least with airport officials unable to give a time-frame for when normal service can be resumed.

Two thousand people were left grounded last night after their flights were cancelled as a result of the security breach - just days before Christmas.

Airlines are working around the clock to find hotels for stranded travellers with families and tourists left queuing outside terminals.

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Dozens of flights were also forced to change course as far away as Paris, Manchester, Liverpool, Cardiff and Birmingham.

Several jets were left circling Britain's second busiest airport last night as a police helicopter searched for the rogue drones.

Sussex Police said the suspects responsible for the security breach deliberately tried to delay flights, reports claim.

Cops now have 20 units hunting for the drone operators and if convicted they could face up to five years in prison.

Shocking footage posted online appeared to show one of the drones hovering just yards away from a packed passenger plane.

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Sun Online Travel previously revealed that the number of serious near-misses by planes has risen by 58 per cent in the last five years – with many of these down to drones.

Accidents numbers have also gone up, from 654 in 2013, to 708 in 2017.

There were 172 reports of near-misses in the skies in 2013, and 272 reports last year, known as “airproxes”.

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A report by the  states that this is due to increasingly busy skies as well as more and more drones being used.

In 2013, there were zero near-misses from drones, but in 2017 there were 93.

Civil Aviation Authority spokesperson Jonathan Nicholson said that incidents around London and the South East are due to crowded skies.

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However in the north of the country, they are more to do with the air space being less crowded.

Jonathan said: "Pilots in this more open air space tend to relax and think they are in a much freer, more open, sky… [that] can lead to an accident or an airprox".