The outspoken airline boss, who campaigned for Remain, added, “The sensible outcome here is to ignore the plebiscite of 12 months ago, stay in Europe and continue to benefit from Open Skies.”

Mr O’Leary said, “We’ll be taking a lot of aircraft out of the UK in the April of 2019 and reallocating them to European regional airports and they’ll be seeing a lot more growth than they’ll know how to handle.

“Although Heathrow, thankfully, will be empty probably for a period of months.”

Mr O’Leary attacked the British government for not having a “Plan B” and for sticking to its red lines on the jurisdiction of the European Court of Justice and EU rules of free movement on people.

“There’s nobody in the UK government that has a clue how to do a deal. They don’t even know what the hell it is they want other than they want to leave the ECJ’s jurisdiction.”

He claimed one senior Brexit minister had told him the lost European airline traffic could be made up through a bilateral agreement with Pakistan.