Security is the big sticking point on why many flyers of business jets prefer not to be tracked. The threats could stem from terrorists to animal rights extremists to self-proclaimed anarchists to autograph seekers to people that just hate rich people and want to make a statement via a violent act.
That is why most private aircraft owners are allowed to block flight information from the public.
Today, more than 5,100 U.S.-registered aircraft have their flight information blocked from public view, according to an April 2013 list sent to commercial flight-data vendors. That number at one point had dropped to fewer than 700 before Congress forced the policy reversal.