Drone delivery on duty in Tonglu

http://www.ehangzhou.gov.cn/2021-12/20/c_278984.htm 

United invests in hydrogen-electric engine developer ZeroAvia

https://www.businesstraveller.com/business-travel/2021/12/21/united-invests-in-hydrogen-electric-engine-developer-zeroavia/ 

US's Tailwind Air eyes electric seaplanes

https://www.ch-aviation.com/portal/news/110867-uss-tailwind-air-eyes-electric-seaplanes

SpaceX vs. Airbus: Jean-Marc Nasr Flexes on SpaceX CEO About Mars in 2026, Elon Musk Accepts Challenge | Tech Times

https://www.techtimes.com/articles/269591/20211220/spacex-vs-airbus-jean-marc-nasr-flexes-ceo-mars-2026.htm