Anyone foolish enough to think your flight can't be tracked by blocking your tail number is fooling themselves.

Every single blocked aircraft can be tracked using 'acars'.

There are enthusiast groups all over the world tracking flights worldwide, just google 'acars'. ACARS decoders are available to download for free.

Doesn't matter if you block using the BARR program or not. Even military flights are easily tracked.

As for ProPublica obtaining a list of blocked BARR aircraft, companies such as JETNET provide a list of every bizjet worldwide. They list the lessee, lessor, owner, operator. Other free services like LAAS, airlinerlist.com, FAA, Canadian Civil Aircraft Registry - provide aircraft info and production lists.

There are other free services that tie up Flight Numbers - to their tail numbers.

So for example, I could enter a free flight alert on FlightAware for Global XRS. Every US Global that isn't blocked will show up. If one is blocked, either their tail number or flight number will state the owner has requested this aircraft blocked. If it doesn't show up at all - then it has been blocked using the BARR program.

So all the court battle by the NBAA vs. ProPublica - the information was always available for free on the internet!!!