Discovered FlightAware during weekly flight commutes from Milwaukee to Sault Ste Marie. Tracking inbound flights, more importantly delayed or cancelled flights proved extremely helpful, especially when upstaging the airlines own communications.
This United overbook situation had just the opposite outcome - http://www.dailymail.co.uk/news/article-4396986/Passengers-film-moment-police-drag-man-United-plane.html
The DAS Atlanta Data Center is 'fed' from two separate power grids, each from a unique power plant. This was a computer software failure.....thus Georgia Power's response of 'BS' to power failure!