Aerospace research is a long-term business. Moving from laboratory to production can take 20 years— longer if the result is as significant as a new airframe configuration or propulsion architecture. So industry has already chosen its path to the mid-2020s and has few roads left to take to the mid-2030s. Beyond that, the route is less certain, but even now investment decisions are being taken that begin to map those roads. . . . CLEANER Not everyone believes in climate change. Not ...

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