1. 1) IATA：“Carbon emissions per passenger decrease more than 50 % since 1990” https://www.iata.org/en/pressroom/pr/2019-12-12-01/（参照 2021-09-11）
2. 2) AIRBUS ： “Fly the aviation revolution with e-fan” https://www.airbus.com/company/history/airbus50/day8.html （参照 2021-09-11）
3. 3) A. Nishizawa, H. Kobayashi, T. Iijima, K. Yamazaki, M. Okuyama, T. Tagashira, Y. Hirano, A. Yoshimura, S. Shindo and K. Okai: “Flight demonstration of electric aircraft technology for harmonized ecological revolution (FEATHER),” JAXA Research and Development Memorandum JAXA-RM-16-006 (2017) 1-17 (in Japanese)
4. 4) M. Anderson: “Order for first all-electric passenger airplane placed by Massachusetts carrier,” IEEE Spectrum 09.19 (2019) 10-11
5. 5) P. Rostek: “E-aircraft system programme LuFo-V2 TELOS,” presented in Ziehl VI workshop (2018)