Armed police officers patrol Manchester Airport. British police have said they had foiled a plot to blow up planes to the United States in mid-air, putting the nation on its maximum terror alert and snarling air traffic around the world.(Xinhua/AFP Photo)

Travellers queue at Gatwick international airport on the outskirts of London, following the introduction of heightened security measures August 10, 2006.(Xinhua/Reuters Photo)

A screen shows cancelled flights at Terminal One of Heathrow Airport in London, August 10, 2006.(Xinhua/Reuters Photo)

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