It seems that the world is inching ever closer to being the setting of a hit sci-fi novel. The latest evidence? A solar-powered aircraft is set to complete a historic cross-country trip Saturday night. The craft, called the Solar Impulse, took flight May 3 in San Francisco and set off on the final leg at 5 a.m. Saturday from Washington, D.C.'s Dulles International Airport. It's set to land around 2 a.m. Sunday at JFK International Airport in New York City. OK, so it's not the quickest mode of transportation just yet. But they're working on it: a 'round-the-world trip for an upgraded version of the plane is already being planned for 2015.