After a nine-month delay, the solar-powered, zero-fuel airplane Solar Impulse 2 is back in the skies, continuing its historic trek around the world.
The plane took off from Kalaeloa Airport in Hawaii on Tuesday, and is bound for Moffett Airfield in Mountain View, California. This is the ninth leg of its journey.
The Solar Impulse 2's global tour began in March 2015 in Abu Dhabi. After finishing its eighth leg in July 2015 from Japan to Hawaii -- the longest leg so far in terms of distance (5,545 miles or 8,924 km) and time (about 5 days) -- the plane had to chill out in Hawaii for a spell so crews could fix its overheated batteries.
From California the Solar Impulse 2 will fly to New York and Europe and land back at Abu Dhabi. Given fair weather conditions, the flight to Mountain View should take about three days, with a landing expected Sunday, April 24.
You can watch this leg of the journey, live, at the Solar Impulse website and in the YouTube video embedded below.