It's the Solar Impulse, an aircraft that powered by light - but that can still soar in darkness because it uses batteries to store energy gathered during daytime flight.
It isn't exactly supersonic, however. But it is going to fly around the world. In rather less than 80 days.
Bloomberg's Thomas Mulier and Patrick Winters write that the duo of pilots taking turns at the controls with need to "withstand flying non-stop for five days and nights to prepare for ocean crossings stuffed in a tiny cabin traveling as high as 27,000 feet at about 45 miles per hour."
The aircraft has covered vast distances before: In 2013, it was flown (slowly) across the U.S., in multiple legs, and it's flown (slowly) across continents, from Switzerland to Morocco.Even though it lacks afterburners, it still looks cool, lazily transiting the skies above the world's cities.
Check this recent video, from the organization behind the plane: