Flightradar24 (website: http://www.flightradar24.com) is a Swedish internet-based service that shows real-time aircraft flight information on a map. It includes flight tracks, origins and destinations, flight numbers, aircraft types, positions, altitudes, headings and speeds. It can also show time-lapse replays of previous tracks and historical flight data by airline, aircraft, aircraft type, area or airport. It aggregates data from multiple sources but, outside of the United States, mostly from crowdsourced information gathering by volunteers with ADS-B receivers. The service was founded as a hobby in 2006 by two Swedish aviation enthusiasts. It is available via a web page or mobile device apps.