The consequent problems are becoming apparent to the seven Labour-controlled councils which own Newcastle Airport.

ECONOMIST: Airport privatisation

It is also used as a signal for airline pilots flying towards Newcastle Airport to turn towards the mainland.

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Newcastle Airport remains open, but some domestic air services to and from the south and west have been cancelled.

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And the campaign for control of Air Passenger Duty is already causing concern at the business it could draw north from Newcastle Airport.

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If, on the other hand, the government does as Newcastle councillors want, and allows them to borrow the money needed to pay for the airport's expansion, ministers will send a clear signal that they are not much interested in privatisation.

ECONOMIST: Airport privatisation