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Solar-powered airplane leaves Northern California on first leg of trip to several US cities

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    The Solar Impulse plane takes off on a multi-city trip across the United States from Moffett Field NASA Ames Research Center in Mountain View, Calif., Friday, May 3, 2013. Solar Impulse, considered the world's most advanced solar-powered plane, will stop for seven to 10 days at major airports in each city, so the pilots can display and discuss the aircraft with reporters, students, engineers and aviation fans. It plans to reach New York's Kennedy Airport in early July — without using a drop of fuel, its creators said. (AP Photo/Tony Avelar)The Associated Press

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    The Solar Impulse pilot Bertrand Piccard, left, enters the cockpit before taking off to embark on a multi-city trip across the United States from Moffett Field NASA Ames Research Center in Mountain View, Calif., Friday, May 3, 2013. Solar Impulse, considered the world's most advanced solar-powered plane, will stop for seven to 10 days at major airports in each city, so the pilots can display and discuss the aircraft with reporters, students, engineers and aviation fans. It plans to reach New York's Kennedy Airport in early July — without using a drop of fuel, its creators said. (AP Photo/Tony Avelar)The Associated Press

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    Bertrand Piccard, pilot of the Solar Impulse plane, speaks to reporters before taking off on a multi-city trip across the United States from Moffett Field NASA Ames Research Center in Mountain View, Calif., Friday, May 3, 2013. Solar Impulse, considered the world's most advanced solar-powered plane, will stop for seven to 10 days at major airports in each city, so the pilots can display and discuss the aircraft with reporters, students, engineers and aviation fans. It plans to reach New York's Kennedy Airport in early July — without using a drop of fuel, its creators said. (AP Photo/Tony Avelar)The Associated Press

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    The Solar Impulse plane sits on the tarmac early in the morning before takes off on a multi-city trip across the United States from Moffett Field NASA Ames Research Center in Mountain View, Calif., Friday, May 3, 2013. Solar Impulse, considered the world's most advanced solar-powered plane, will stop for seven to 10 days at major airports in each city, so the pilots can display and discuss the aircraft with reporters, students, engineers and aviation fans. It plans to reach New York's Kennedy Airport in early July — without using a drop of fuel, its creators said. (AP Photo/Tony Avelar)The Associated Press

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    Pilots Bertrand Piccard, right, and André Borschberg, left shake hands before the Solar Impulse plane takes off to embark on a multi-city trip across the United States from Moffett Field NASA Ames Research Center in Mountain View, Calif., Friday, May 3, 2013. Solar Impulse, considered the world's most advanced solar-powered plane, will stop for seven to 10 days at major airports in each city, so the pilots can display and discuss the aircraft with reporters, students, engineers and aviation fans. It plans to reach New York's Kennedy Airport in early July — without using a drop of fuel, its creators said. (AP Photo/Tony Avelar)The Associated Press

A solar-powered airplane left Northern California on Friday for the first leg of a planned cross-country trip that its co-pilot described as a "milestone" in aviation history.

The Solar Impulse — considered the world's most-advanced sun-powered plane — left Moffett Field in Mountain View just after dawn. Its creators said the trip is the first attempt by a solar airplane capable of flying day and night without fuel to fly across America.

It plans to land at Sky Harbor airport in Phoenix, Dallas-Fort Worth airport in Texas, Lambert-St. Louis airport, Dulles airport in the Washington area and New York's John F. Kennedy airport. Each flight leg will take about 19 to 25 hours, with 10-day stops in each city.

"All the big pioneers of the 20th century have tried to fly coast to coast across America," said co-pilot and one of the plane's founders, Bertrand Piccard. "So now today we're trying to do this, but on solar power with no fuel with the first airplane that is able to fly day and night just on solar power."

The plane is powered by about 12,000 photovoltaic cells that cover massive wings and charge its batteries.

The delicate, single-seat Solar Impulse flies around 40 mph and can't go through clouds. It weighs about as much as a car, making it vulnerable to bad weather.

Its creators said solar planes will never replace fuel-powered commercial flights. But the goal is to showcase the potential of solar power.

"What we look for is to have a new milestone in this very exciting history of aviation that can attract interest of the people, of the political world, of the media and show that with renewable energies and clean technology for energy efficiency, we can achieve impossible things," Piccard said.

The plane has previously impressed audiences in Europe. It is expected to reach Phoenix around 1 a.m. Saturday.