Electric aircraft are moving along in development more rapidly than many expected: Once a Joke, Battery-Powered Airplanes Are Nearing Reality – MIT Technology Review

Aerospace companies are working on hybrid electric airplanes, and the earliest versions will likely arrive before the end of the decade.

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At the other end of the technology and speed spectrum, hypersonic flight, particularly with scramjets, continues to develop very slowly: Darpa Refocuses Hypersonics Research On Tactical Missions – Aviation Week.