It’s hard to believe that the Solar Impulse has been on its Cross America tour since May 3, but its early touchdown at New York City’s John F. Kennedy International Airport late Saturday night was cause for elation on at least two counts. First, as the Solar Impulse team points out, “For the first time a plane capable of flying day and night powered exclusively by solar energy has crossed the USA from the West to the East Coasts without using a single drop of fuel.” As we love to point out, though, it’s not the first time a solar-powered airplane has made the trip. Eric Raymond did it in 21 hops in 1990 in Sunseeker 1, using the technology available at the time – which did not allow overnight flights. Both trips are literally epic voyages, nonetheless. Second, for several anxious hours the flight, the airplane and even the fate of pilot Andre’ Borschberg, Solar Impulse’s co-founder and CEO, …