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https://aviationbenefits.org/media/167186/abbb2020_full.pdf
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https://documents1.worldbank.org/curated/en/364321491414311301/pdf/114059-AR-PUBLIC-ADD-SERIES-73p-AFTP4-2016FYAirTransportAnnualReport.pdf
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https://www.europarl.europa.eu/RegData/etudes/BRIE/2021/689346/EPRS_BRI(2021)689346_EN.pdf
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https://ec.europa.eu/transport/sites/transport/files/2019-aviation-environmental-report.pdf