Solar Impulse pilot and co-founding CEO André Borschberg boards the plane Friday morning for the fourth leg of the "Across America" campaign.

History departed this week with the takeoff of Solar Impulse early Friday morning. The revolutionary aircraft, which can fly day and night without a drop of fuel, had an extended 10-day stay at Lambert-St. Louis International Airport as part of its "Across America" campaign. More than 8,000 people got to see the plane upclose during open house exhibitions at the Airport. Solar Impulse is a flying aviation lab of new technologies which is helping to promote science, engineering and environmental causes. The plane departed on it’s fourth leg of its cross-country mission bound for Cincinatti (pilot change) and then Washington, DC. Solar Impulse will end its U.S. trek in New York City in the next few weeks.