Solar Impulse: Ready for historic Pacific Ocean flight

The Solar Impulse team is preparing to set off on the next leg of their mission to fly a solar-powered plane around the world.

They have spent the past five weeks in eastern China waiting for the right weather before embarking on a non-stop flight to Hawaii.

The Pacific Ocean stretch is the most difficult and most dangerous phase of the voyage and, if successful, will be the longest solo flight in history.

John Sudworth reports.