As an industry leader providing high-quality service, excellent project coordination and communication, and on-time delivery Duncan Aviation is one of the World's Greatest! Duncan Aviation is the largest privately owned business jet service provider in the world. With complete Maintenance, Repair and Overhaul (MRO) service offerings at three beautiful US facilities, strategically placed regional shops, and mobile technical teams able to provide services worldwide, we help business aircraft operators get the most value from their aircraft ownership.