The experimental Solar Impulse 2, a plane powered entirely by the sun, took off from New York City early Monday morning, en route to Seville, Spain. The first-ever attempt to cross the Atlantic using only solar power is expected to take around 90 hours and is one of the tougher legs of the scheduled voyage around the world.

Swiss pilot (and psychiatrist) Bertrand Piccard is at the controls. The flight was previously scheduled to leave Sunday but was pushed back for weather, since the ultra-light craft is highly sensitive to winds.

Piccard is alternating flights with Swiss entrepreneur Andre Borschberg on a total voyage that is expected to cover 22,000 miles (35,000 kilometers) around the world. The plane left Abu