Air traffic around JOYCE

Plane positions with callsign, altitude and type in a map and in the sky above JOYCE.
Colored Dots mark former positions of any airplane with color indicating height (red=low, blue=high).
'+'-signs indicate Joyce in the center and airports or air fields at
Düsseldorf (DUS), Köln-Bonn (CGN), Nörvenich (ETTN), Geilenkrichen (ETNG),
Maastricht-Aachen (MST), Aachen Merzbrück (AAH), Mönchengladbach (MGL), Niederrhein(Weeze) (NRN), Liége (LGG).
This is a Test. I run the script only occassionally. You may see only old data.
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ADS-B data from "The OpenSky Network", www.opensky-network.org, see: Schäfer et al. 2014.