Follow the instructions of the research paper step by step, and try to use at least 3 out the 5 following references :1. Cook, G. N., & Billig, B. G. (2017). Airline operations and management: A management textbook. London, [England];New York, New York;: Routledge.2. Doganis, R. (2010). Flying off course: Airline economics and marketing (4th ed.). New York, NY: 3. Routledge. ISBN 0-415-44737-2 Doganis, R. (2006). The airline business (2nd ed.). New York, NY: Routledge. ISBN 0-415-34615-0 4. Shaw, S. (2011). Airline marketing and management (7th ed.). Burlington, VT: Ashgate. ISBN 978-1-4094-0149-05. Vasigh, B., Fleming, K., and Tacker. (2013). Introduction to air transport economics (2nd ed.).
