The decades-old dream of zipping around in the sky as simply as driving on highways may be becoming less illusory. Japan's SkyDrive Inc., among the myriads of "flying car" projects around the world, has carried out a successful though modest test flight with one person aboard. In a video shown to reporters on Friday, a contraption that looked like a slick motorcycle with propellers lifted several feet (1 to 2 meters) off the ground, and circled around slowly in a netted area for four minutes. Tomohiro Fukuzawa, who heads the SkyDrive effort, said he hopes "the flying car" can be made into a real-life product by 2023 but acknowledged that making it safe was critical. "Of the world's more than 100 flying car projects, only a handful has succeeded with a person on board," he said. "I hope many people will want to ride it and feel safe."