Solar Impulse 2 has made history yet again. Earlier this month it finally completed the US leg of its "around the world" journey bourne on solar-powered wings. From New York, where it made a pit stop last June 11, it has now landed in Seville, Spain. This makes it the first solar-powered aircraft to cross the Atlantic ocean, in the tradition of the first voyages from Europe to the Americas and back. But as historic as the achievement is, the feat of the pilots themselves are equally impressive.