1. Air Transport Association of America. (1967). Standard method of estimating comparative direct operating costs of turbine powered transport airplanes. Retrieved May 15, 2011 from: http://adg.standford.edu/aa241/cost/atamethod.html
2. Airways Magazine, Coronavirus Dwindles the Commercial Aviation Industry. https://airwaysmag.com/industry/coronavirus-dwindles-aviation-industry/
3. Bharda, D. (2003). Choice of aircraft fleets in the US NAS: Findings from a multinomial logit analysis. Center for Advanced System Development (CAASD), The MITRE Corporation, Technical Papers.
4. Bombardier. (2011). CRJ jetSense: Scope Clauses Continue to Allow Larger Regional Aircraft.
5. Gao, C. E., Johnson, & Smith, B. (2009). Transportation Science, 43(1), 2–15.