1. 14 C.F.R. § 121, 2020. Operating requirements: Domestic, flag, and supplemental operations. https://www.govinfo.gov/app/details/CFR-2011-title14-vol3/CFR-2011-title14-vol3-part121.
2. 14 C.F.R. § 91.25, 2020. Aviation Safety Reporting Program: Prohibition against use of reports for enforcement purposes. https://www.govinfo.gov/app/details/CFR-2013-title14-vol2/CFR-2013-title14-vol2-sec91-25.
3. Airbus, 2021. Accidents by flight phase. https://accidentstats.airbus.com/statistics/accident-by-flight-phase.
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