Saw this "Breaking News" from The Denver Post: "The National Transportation Safety Board is investigating a near-miss at Denver International Airport involving a Frontier Airlines jet and a Key Lime Air flight. The planes passed within 50 feet of each other, around 7:30 this morning." I follow up with this article from: http://www.denverpost.com/ci_4957824 Near-miss for planes at DIA By Jeffrey Leib, Denver Post Staff Writer DenverPost.com Article Last Updated: 01/05/2007 03:08:38 PM MST A Frontier Airlines plane landing at Denver International Airport this morning came within 50 feet of hitting a small aircraft that had "inadvertently entered the runway" in front of it, the National Transportation Safety Board said. Pilots of the Frontier A-319 saw the Swearingen Metroliner, Key Lime Air flight 4216, on the runway as they were about to land, and they "immediately executed a missed approach" -- aborting the landing, NTSB said. An automated warning called the Airport Movement Area Safety System, or AMASS, alerted air traffic controllers in DIA's tower to the looming conflict on the runway just about the time Frontier's crew saw the Key Lime plane on the airfield, officials said. "Bottom line is that the system worked," said Federal Aviation Administration spokesman Allen Kenitzer, referring to the AMASS alert. AMASS is a ground radar system that warns of potential conflicts on the airfield. Weather at the time of the incident included snow and mist, with one-half mile visibility and a ceiling of 600 feet overcast, NTSB said.