ADSBexchange.com is the world’s largest source of unfiltered flight ADS-B data. Thanks to our worldwide community of participants, if the data is broadcast over the air, you can find it here. This opens up a whole new world of interesting traffic for hobbyists, without materially affecting security for anyone.
ADS-B Exchange differs from typical flight tracking sites in two primary ways. First, all data sent in from the community is, in turn, made available back to the community through various archives and APIs. (www.adsbexchange.com/data). Best of all, for non-commercial use, all of this data is freely accessible to anyone!