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Nigel Wicking, chief executive of the Heathrow Airline Operators Committee, which represents airlines that use the west London airport, said a "couple of incidents" had made him concerned.

Heathrow insisted after the hearing that Mr Wicking was referring to matters which had "no relation" to the North Hyde substation that caught fire.

Mr Wicking said the shutdown cost airlines £60m to £100m.

“We could see these massive flames wicking off the top of the mountain and moving fast,” he said.

Nigel Wicking, chief executive of Heathrow Airline Operators Committee, says all of the costs are passed on to travellers.