Actually, Boeing Dreamliner aircraft use lithium ion batteries...

Actually, Boeing Dreamliner aircraft use lithium ion batteries as part of everyday flying. Not for propelling the plane but to support the many electrical loads on a passenger airplane. Early Dreamliners did have problems with batteries overheating, causing the plane to be grounded back in 2013 IIRC, but the design was revised and other than 1 isolated incident since then that I’m aware of, lithium ion batteries are in daily use on arguably the best passenger jet in the world today.