Electric Aircraft Start-Up Accuses Rival of Stealing Its Secrets - The New York Times
https://www.nytimes.com/2021/04/06/business/wisk-archer-lawsuit.htmlRolls-Royce concludes testing of plane technology set to break electric speed record
https://techxplore.com/news/2020-09-rolls-royce-plane-technology-electric.htmlSolar-powered aircraft flown for nearly three weeks without landing | E&T Magazine
https://eandt.theiet.org/content/articles/2021/10/solar-powered-aircraft-flown-for-nearly-three-weeks-without-landing/