1. IATA. "Air Transport and Climate Change." [IATA.org](https://www.iata.org/en/pressroom/2021/releases/2021-10-06-01/)
2. European Commission. "A Hydrogen Strategy for a Climate-Neutral Europe." [europa.eu](https://ec.europa.eu/energy/topics/renewable-energy/hydrogen_en)
3. Airbus. "ZEROe: Towards the World's First Zero-Emission Commercial Aircraft." [Airbus.com](https://www.airbus.com/en/innovation/zero-emission/hydrogen/zeroe)
4. Clean Sky 2 Joint Undertaking, "Hydrogen-Powered Aviation," [Clean Sky](https://www.cleansky.eu/hydrogen-powered-aviation)
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