One of the most breathlessly anticipated revolutions in U.S. aviation is poised to take off in 2006, as new super-fast, relatively cheap airplanes called "very light jets" finally go into service. Thanks to breakthroughs in the performance of engines for small jets, along with better airplane manufacturing techniques...a new breed of aircraft for a new category of travel: jet-speed transportation between as many as 5,500 U.S. airports, in planes that cost as little as $1.5 million. That's a fraction of the price of today's private jets. Pending final certification by the Federal Aviation Administration this winter...Eclipse's six-seater E500 could be...