Mountain Mountain View, California, United States: Solar Impulse’s HB-SIA prototype, with Bertrand Piccard at the controls, is starting the crossing of America. First leg is Moffett Airfield at the Ames Research Center of NASA to Phoenix Sky Harbour Airport. Solar Impulse will fly across America in stages over May-June-July from San Francisco to Washington D.C. and New York City. . © Fred Merz / Rezo.ch / Solar Impulse