1. ATAG homepage. https://www.atag.org/facts-figures.html. Accessed 2 Mar 2021
2. Clean Aviation homepage. https://clean-aviation.eu/files/Clean_Aviation_SRIA_16072020.pdf. Accessed 12 Mar 2021
3. Modern Airliners home page. https://modernairliners.com/airbus-a330/airbus-a330-specs/. Accessed 12 Mar 2021
4. Embraer homepage. https://www.embraer.com/global/en/news?slug=1207138-embraer-the-shape-of-things-to-come-new-sustainable-aircraft-concepts-revealed. Accessed 26 June 2023
5. Airbus homepage. https://www.airbus.com/en/innovation/low-carbon-aviation/hydrogen/zeroe. Accessed 26 June 2023