CHICAGO - Suburban opponents of the Wayne County Airport Authority's $3.6 billion expansion of Detroit Metropolitan Wayne County Airport said in a report this week that recent federal aviation data shows the airport is overstating its need for a fifth parallel runway.

The report comes a week before the seven-member airport authority board is set to vote on the expansion plan, which includes the fifth runway, the expansion of an existing runway, a passenger transportation rail system, and other terminal expansion projects. If the board approves the plan, it would then go to the Federal Aviation Administration for review.

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