Iridium satellites are to be replaced using SpaceX rockets.
Will the new LEO satellites be used for continuous tracking of commercial flights?
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The next generation of Iridium satellites will have ADS-B receivers installed on them which will be used to track properly equipped aircraft. The company providing this service is Aireon.
Most airliners are already equipped with ADS-B transmitters. From 2020 it is manadatory on the USA and in Europe to have ADS-B.
The first satellite were to be launched earlier this year, but so far nothing has been launched.