Solar Impulse II gets clearance for takeoff after a three week wait, and sets off to continue its historic journey.
The solar powered aircraft took off from Nagoya, Japan to Hawaii on the eighth leg of its round the world voyage.
Bad weather had delayed departure for the longest and most risky stage of the mission.
Swiss businessman and pilot André Borschberg is aiming to fly for 5 days non-stop – he plans to practise polyphasic sleep meaning splitting up rest time into 20 minute power naps. The cockpit seat is adjustable to make it into either a bed or a yoga mat to practise poses that will improve blood circulation.
The plane which took off from Abu Dhabi in March is powered by 17,000 solar cells, and was expected to clock 25 flight days broken up into 12 legs.
The project aims to change people’s ideas about what is possible with alternative energy sources.
You can watch its progress LIVE.