Before its coast-to-coast American trip, the Solar Impulse will take test flights around the San Francisco Bay Area in April, officials said.

WSJ: Solar plane plans stops in Phoenix, Dallas, NYC

Speaking of sun-powered planes, the Solar Impulse just made its final test flight around the San Francisco Bay Area before embarking on a cross-country voyage next week.

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The plane, Solar Impulse, is expected to be ready to leave from the San Francisco Bay Area on May 1, although the actual departure will depend on the weather, the plane's Swiss creators said at a news conference at the NASA Ames Research Center in Mountain View, Calif.

WSJ: Solar plane plans stops in Phoenix, Dallas, NYC