This tutorial introduces the OpenSky Network (https://opensky-network.org), a community-based receiver network which continuously collects air traffic surveillance data and makes it accessible to researchers for free. Using a global network of over 4000 Mode S and ADS-B receivers, the network has collected and provides over 2 PB of surveillance data. This data has been used by academics, authorities and companies around the world for their research, resulting in more than 200 peer-reviewed publications to date. Martin and Xavier will provide an overview on how the OpenSky Network works and which data is available. Moreover, using several case studies, they will demonstrate what kind of analyses are possible and how to use OpenSky’s data set for your research. In particular, they will show how to use the traffic library in order to use the large amount of air traffic data provided by OpenSky conveniently and efficiently.