1. FAA: Benefit‐cost analysis.https://www.faa.gov/regulations_policies/policy_guidance/benefit_cost/. Accessed August 1 2018
2. Drivers of airline loyalty: Evidence from the business travelers in China
3. U.S. Department of Transportation: Air travel consumer report various issues. 1998–2012
4. The impact of flight delays on passenger demand and societal welfare
5. Joint Economic Committee report: Your flight has been delayed again: Flight delays cost passengers airlines and the U.S. economy billions.https://www.jec.senate.gov/public/index.cfm/democrats/2008/5/your-flight-has-been-delayed-again_1539. Accessed 15 July 2020