Ask for a list of deliverables in writing. Demand tangible evidence on how the consultant is working on your behalf including an action item list, results, responsible parties and due dates. Require a definition of the project. Request references and biographies of the consultants' experience and compare them before making a decision on which consulting firm or individual to use. Call the references given.
Many consultants have experience working in different facets of corporate aviation.
You can start your search at the NBAA or by reading trade journals, but the best resource is networking, personal knowledge of individuals within a consulting company and their personal reputations. Bringing together a diverse group of aviation specialists and industry leaders, ACI uses a team approach, which provides clients with access to a broad base of knowledgeable corporate aviation authorities. ACI is in the aviation information business with its core work in managing interior completions on heavy business jets. Full-time representatives operate from the completion center to cover all phases of the process. Engineers, maintenance and executive management staffs make up the additional interface required to assure top quality interior completions.