Stuffed inside a single-seat aircraft, Borschberg survived on 17,000 solar cells, using stored energy to continue flying after dark. As relieved as he must be, his work isn't done: In order to complete a round-the-world trip, the Solar Impulse must make it to back to Abu Dhabi. Next up: a flight to Phoenix, followed by a longer one to New York and then an even longer one across the Atlantic. Fortunately, Borschberg doesn't have to do it alone; he's been trading off flying duty with Swiss co-pilot Bertrand Piccard, who greeted Borschberg on the ground in Hawaii when he landed.