With zero drops of fuel and powered only by solar energy, The Solar Impulse 2 plane flew from New York to Sevilla, Spain, completing its historic 71-hour, 6,000-kilometer transatlantic crossing.

Behind the project are two Swiss aviation explorers, André Borschberg and Bertrand Piccard. They are trying to prove the feasibility of zero-emission air travel and have been taking turns in the cockpit for over a year now.

Learn more about their story on Condé Nast Traveler.