O'Hare control tower

The control tower at O'Hare International Airport in 2011. The National Transportation Safety Board released a preliminary report Monday about two near midair collisions -- one in May 2011, the other in August 2011.

( Zbigniew Bzdak, Chicago Tribune / July 1, 2011 )

The control tower at O'Hare International Airport in 2011. The National Transportation Safety Board released a preliminary report Monday about two near midair collisions -- one in May 2011, the other in August 2011.

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