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The Philadelphia area is a helicopter manufacturing center. In addition to Sikorsky, the main plants include Boeing's Ridley Park plant, which employs approximately 4,600 Chinook CH-47 manufacturing and upgrading, vertical take-off Ospreys and the Leonardo factory (AgustaWestland) Northeast Philadelphia Airport, which employs more than 600 civilian helicopters. and plans to expand as he begins to build a model for the Air Force in partnership with Boeing; with the helicopter suppliers.
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