This will take the Solar Impulse vehicle from Dallas to St Louis in a flight expected to last 21 hours. The HB-SIA craft, which has the same wingspan as an Airbus A340 but weighs just 1.6t, took off from Dallas Fort Worth at 04:06 local time (09:06 GMT). via Pocket http://www.bbc.co.uk/news/science-environment-22754126
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