This paper describes the iterative development, evaluation, and improvement of DAV 715: Human Factors in Aviation, an online doctoral course in the Ph.D. in Aviation program at Embry-Riddle Aeronautical University. From 2013 through 2017, data were collected from students enrolled in the course using a learning experience survey and an end-of-course evaluation survey. Participation was completely voluntary and responses were anonymous to encourage students to provide honest and accurate feedback on the course design, workload, and relevance. Data generated from the surveys informed each course update, guided by the 3-Phase Design (3PD) model.