We've been tracking the sun-powered plane known as Solar Impulse for years as it roved hither and yon. Today, Solar Impulse's pilots, Bertrand Piccard and Andre Borschberg, came to NASA's Ames research center to announce their plan to fly across America. The cross-country tour will begin in the Bay Area and end in New York, with stops in Phoenix, Dallas and Washington DC in between. Solar Impulse will also land in either Atlanta, Nashville or St. Louis, with the plane and its pilots set to stay in each locale for about a week to ten days to talk about the project before moving on. For the next month, Piccard and Borschberg will perform test flights around the Bay Area in preparation, and the plan is for the journey to start on May 1st, with an estimated arrival in Gotham sometime in early July.