Duncan Aviation plans to build a new, 320,000-sq-ft facility at Provo Municipal Airport in Utah. Scheduled to open by August 2010 and representing an initial investment of “around $20 million,” it will provide services including airframe, engine, avionics, interior completion and exterior paint. Duncan already operates two similar full-service centers, one at its headquarters in Lincoln, Neb. and one in Battle Creek, Mich.