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Associated Press
An airport worker puts the final touches on a billboard showing the way to the Hamad International Airport, in Doha, Qatar, Monday, April 1, 2013. The chief overseer of Qatar's new international airport said in a statement Monday, just hours before the scheduled inaugural flight, that the opening of the facility has been delayed because of the need to address new safety requirements. (AP Photo/Osama Faisal)

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