Any ADS-B heads in the SF Bay Area can help me track the answer down.<p>A couple months ago if I heard the ghetto bird flying overhead I could jump on adsbexchange.com and find the details. It was always a tail number ending in PD.<p>Now I can't, for about the last 2 months, see that info anymore. It's clearly PD overhead, but I just see MLAT info now. Like this. https://globe.adsbexchange.com/?icao=~2b093f<p>I know buzzfeed put out that article about tracking military/police flights in June, which drew a lot of attention to this info. Even though it had been available for a while by then.<p>Why did this info only recently get censored? Any change in law or is this just someone finally realizing the info was there and squashing it?
We're not censoring anything.<p>They changed their transponders to either military stuff or ModeC which can't be easily identified.<p>TIS-B are traffic information broadcast by ATC so we're not getting signals directly from the aircraft.
There were a few recent HN posts about "ADS-B privacy"<p><a href="https://hn.algolia.com/?dateRange=all&page=0&prefix=true&query=faa%20privacy&sort=byDate&type=comment" rel="nofollow">https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...</a><p>I wonder if the change you're seeing is due to adoption of this new mechanism.