FlightAware

FlightAware is a global aviation software and data services company based in Houston, Texas, United States. The company operates a website and mobile applications which offer free flight tracking of both private and commercial aircraft around the globe. It is currently the world's largest flight tracking platform with a network of over 23,000 ADS-B ground stations in 197 countries. FlightAware also provides services and data to aircraft and airport operators as well as other aviation organizations to assist in their operations. FlightAware provides enterprise services and tools to aircraft operators worldwide as well as flight tracking systems to airports in over 50 countries across North America, Europe, and Oceania.The company has its headquarters at Eleven Greenway Plaza in Houston, and an advertising office at 500 Fifth Avenue in New York City. Wikipedia