Passengers look at a flight information board at Madrid Barajas airport on December 11, 2011. Spain's debt-struck government says it plans to sell off a stake in airport operator AENA to private

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Passengers look at a flight information board at Madrid Barajas airport on December 11, 2011. Spain's debt-struck government says it plans to sell off a stake in airport operator AENA to private investors next year.

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