1.According to the article, why do batteries make it so hard to build a large electric passenger jet?
2.The article notes a combustion-engine plane 'benefits from getting lighter as fuel is burnt.' Why doesn't an electric plane get this benefit?
3.In a 'series' hybrid like the one described, what is the fuel-burning engine's actual job?
4.A concert venue sits next to a quiet neighborhood, and late shows keep residents awake even though they never bought tickets. In economics, the residents' lost sleep is an example of a(n):
5.Farnborough hosts an 'eponymous biennial air show.' What do those two words tell you about the show?