09/12/2019 -- ADSBEXCHANGE.COM may not currently be allowing free usage of the API without a key.
This code can be used to get ADS-B data from adsbexchange.com using Virtual Radar Server's AircraftList.json format.
- https://www.adsbexchange.com/datafields/
- http://www.virtualradarserver.co.uk/Documentation/Formats/AircraftList.aspx
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