One of the core components of the NextGen system, ADS-B, is already mandatory for airlines in some countries (such Australia). Its how flightradar24 and other s

One of the core components of the NextGen system, ADS-B, is already mandatory for airlines in some countries (such Australia). Its how flightradar24 and other sites manage to get real time info. http://www.flightradar24.com/about http://www.flightradar24.com/about http://en.wikipedia.org/wiki/Automatic_dependent_surveillance_%E2%80%93_broadcast#Implementations_by_country http://en.wikipedia.org/wiki/Automatic_dependent_surveillanc...