They say that
Solar Impulse 2 has taken off.
"A pair of Swiss explorers have begun a mission to circumnavigate the globe via air and sun. A take-off twelve years in the making, the experimental Solar Impulse 2 plane left Abu Dhabi at 7:12 a.m. local time, bound for Muscat, Oman, on the first leg in a journey that will require 25 days in the air spread over a period of roughly 5 months."