Tracking global air traffic in real time

Flightradar24 is a global flight tracking service that provides real-time information for over 180,000 flights a day. It's based on a largely terrestrial network of over 20,000 ADS-B receivers. Flightradar started as a side project in 2006 and now has over 2 million users per day. This is a great example of geospatial in the wild. MapScaping.com