1. Efficiency Report of Flights Operation on 2015,2016
2. On-Time Performance Service Awards Datahttp://www.flightstats.com/company/media/on-time-performance-awards/2015-on-time-performance-service-awards-data/
3. The National Economic Impact of Civil Aviation,2002
4. Total Delay Impact Studyhttp://www.nextor.org/pubs/TDI_Report_Final_11_03_10.pdf