Kit Walker
 lvl.3
Australia
Offline
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Although this is a brilliant idea.., especially for drones.
Just be aware that this App does not show all aircraft in the sky.., yet. 'Flightradar24' gets their information from a range of sources.
ADS-B
ADS-B is a relatively new technology under development, which means that today it's rarely used by Air Traffic Control (ATC). Our estimations show that roughly 70% of all commercial passenger aircraft (80% in Europe, 55% in the US) are equipped with an ADS-B transponder. For general aviation this number is probably below 20%.
MLAT
In some regions with coverage from several FR24-receivers we also calculate positions of non-ADS-B equipped aircraft with the help of Multilateration (MLAT), by using a method known as Time Difference of Arrival (TDOA). By measuring the the time it takes to receive the signal from aircraft with an older ModeS-transponder, it's possible to calculate the position of these aircraft. Four FR24-receivers or more, receiving signals from the same aircraft, are needed to make MLAT work. MLAT coverage can only be achieved above about 3,000-10,000 fee
FAA
In addition to ADS-B and MLAT data, we also get data from the Federal Aviation Administration (FAA) in the United States. Unlike the ADS-B and MLAT data that is presented in real-time, the FAA data is delayed by roughly 5 minutes due to FAA regulations. On the Flightradar24 map, all aircraft based on FAA data are colored orange.
Flarm
Flarm is simpler version of ADS-B with a shorter range, primary used by smaller aircraft, in most cases gliders. The range of a Flarm receiver is between 20 and 100 km. Flarm receivers are often installed on small airports with a lot glider traffic to track the gliders around the airport.
When ADS-B was initially launched, it was primarily used in commercial passenger aircraft with 100+ passengers. An increasing number of aircraft including smaller aircraft types, are getting ADS-B transponders but, until ADS-B becomes mandatory it's up to the aircraft producer and owner to decide if an ADS-B transponder should be installed or not.
Common aircraft models that usually have an ADS-B transponder and are visible on Flightradar24 (within ADS-B coverage):
•All Airbus models (A300, A310, A318, A319, A320, A321, A330, A340, A350, A380)
•Antonov An-148 and An-158
•ATR 72-600 (most new deliveries)
•BAe ATP
•BAe Avro RJ70, RJ85, RJ100
•Boeing 737, 747, 757, 767, 777, 787
•Bombardier CS100 and CS300
•Embraer E190 (most new deliveries)
•Fokker 70 and 100
•McDonnell Douglas DC-10 and MD-11
•Sukhoi SuperJet 100
•Some newer Ilyushin and Tupolev (for example Il-96 and TU-204)
Common aircraft models that usually do not have an ADS-B transponder and are not visible on Flightradar24 (within ADS-B coverage):
•"Air Force One"
•Antonov An-124 and An-225
•ATR 42, 72 (except most new deliveries of ATR 72-600)
•Boeing 707, 717, 727, 737-200, 747-100, 747-200, 747SP
•BAe Jetstream 31 and 32
•All Bombardier CRJ models
•All Bombardier Dash models
•All CASA models
•All Dornier models
•All Embraer models (except most new deliveries of Embraer E190)
•De Havilland Canada DHC-6 Twin Otter
•Fokker 50
•McDonnell Douglas DC-9, MD-8x, MD-90
•Saab 340 and 2000
•Most helicopters
•Most older aircraft
•Most business jets
•Most military aircraft
•Most propeller aircraft
Of course there are lots of exceptions from these rules. There are some older A300, A310, A320, B737, B747, B757, B767, MD10, MD11 aircraft flying without an ADS-B transponder, which make those aircraft invisible on Flightradar24 when in areas with ADS-B coverage only. But there are also some Twin Otters, Saab 340, Saab 2000 and MD-80 aircraft with an ADS-B transponder that are visible on Flightradar24 in areas with ADS-B coverage.
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lvl.4
