just yesterday workers broke ground on a permanent flight 93 national memorial in shanksville. just the latest sign americans will never forget the terror attacks that forever changed our nation more than a decade ago. rick leventhal is live at the world trade center site. lots of new yorkers will tell you how frustrated they are this is still a construction site but developers point out it s one of the most complex projects imaginable and the heart of a major city with heavy traffic on all sides adjacent to the hudson river with 13 subways and a commuter train running underneath or around the site. they ve navigated obstacles and concerns of family and politicians and the problems can be seen in a time lapse video showing the nine year odyssey from securing the pit and