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Two Russian aircraft flying close to Nato airspace were detected by British fighter jets in separate incidents earlier this week, the UK's Ministry of Defence has said.

For eight days in April 2010 UK and European airspace was closed or partially closed causing chaos to travellers around the world.

There is a chance that debris could reenter commercial or federal airspace and pose a danger to aircraft, for example.

However, once the passengers were on board, a ground crew member advised the departing helicopter pilot that the airspace was clear.

The White House insisted it was too late, as the planes were already in international airspace.