Flightradar24 operates the world's largest network of ADS-B/Mode S receivers.
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Flightradar24 combines data from several data sources including ADS-B, MLAT and radar data. The ADS-B, MLAT and radar data is aggregated together with schedule and flight status data from airlines and airports to create a unique flight tracking experience on www.flightradar24.com and in Flightradar24 apps.
ADS-B is required in Class A, B and C airspace within U.S. domestic airspace and all land mass regions of the U.S. as defined in 14 CFR 1.1 and it includes the states (contiguous and non-contiguous), U.S. possessions, or territories.
Without ADS-B Out, you can fly in any airspace except the ADS-B rule airspace defined by FAR 91.225 (see above). Note that ADS-B is not required in Class D airspace, or under a Class B or Class C airspace shelf, unless it lies within a Mode C veil.
Information about a small number of flights may be limited or blocked based on requests from owners or operators via third-party services, such as the FAA LADD. Some high profile aircraft, such as Air Force One are not displayed.
Flightradar24 is the more customizable of the two, and while FlightAware says it tracks more flights, it lacks options like showing planes on the ground. (There's also a third flight-tracking app and website, Planefinder, which looks and feels similar to Flightradar24 and has the same price for the premium version.)
Flightradar24 is a global flight tracking service that provides you with real-time information about thousands of aircraft around the world. Our service is currently available online and for your iOS (iPhone, iPad, iPod Touch) or Android device.
Pilots can easily make a misstep by turning off their transponder, and there are very limited circumstances which allow a pilot to do so.” Civilian aircraft can turn off their ADS-B Out only if specifically instructed to do so by ATC, or if they are the non-lead aircraft in a formation flight, Duke said.
You may fly without ADSB under the Class B or Class C shelf provided you remain outside of any Mode C veil. §91.225 tells you where you cannot fly. It says you cannot fly within the lateral boundaries of the Class B or C airspace or above the airspace.
Organizations can request an Aircraft Situation Display to Industry (ASDI) block to prevent both ADS-B and mode-S data from appearing on radar data feeds provided by the FAA. Some flight-tracking websites—including Flightradar24 and FlightAware—also honor these blocks.