
https://english.bdi.eu/media/presse/presse/downloads/20180308_Climate_Paths_for_Germany_ExecutiveSummary_FINAL.pdf

https://www.bruegel.org/sites/default/files/2025-08/how-is-innovation-competition-exacerbating-global-overcapacity%3F-11189_0.pdf

http://ec.europa.eu/transport/sites/transport/files/eu_air_carriers_by_country_holding_an_active_operating_licence.pdf