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56 REFERENCES Ricondo & Associates, AirProjects, Camp Dresser & McKee Inc., Crawford Consulting Services, and Orbital Engi- neering, Comprehensive Facility Requirements Study, Pittsburgh International Airport, June 30, 2010. Spafford, C., T. Hoyland, and R. Lehman, State of the MRO Industry 2009: Competitive Shifts and Curtailed Growth, Oliver Wyman, Dallas, Tex., 2009. Yin, R.K., Case Study Research: Design and Methods, 2nd ed., Sage, Thousand Oaks, Calif., 1994.