MadeUpUserName
Re:Mysterious Planes Over Baltimore Spark Surveillance Suspicions
on Friday May 08, 2015 @12:43PM (#9512658)
You miss the fact that ADS-B broadcasts are completely voluntary.
Basically, these were polite "black helicopters."
If they were up to something nefarious, you'd never know, no matter how sophisticated your ADS-B receiver is or what flightradar24 tells you.