Flight tracking exposure irks billionaires and baddies

How to upset Russian freight companies, Elon Musk, Chinese authorities and Kylie Jenner in one go? Track their jets.

Flight following websites and Twitter accounts offer real-time views of air traffic - and sometimes major news like Nancy Pelosi's Taiwan trip - but that exposure draws pushback ranging from complaints to gear seizures.

Whether Russian air freight firms, Saudi Arabian plane owners or others, Dan Streufert said his group gets dozens of "requests" each year to stop posting aircrafts' whereabouts.

"We have not removed anything so far. This is all public information. And I don't want to be the arbiter of who's right and who's wrong," added Streufert, founder of the US-based flight tracking site ADS-B Exchange.

Limits do apply in some cases, but groups that piece together the flight paths note that the core information source is legally available and open to anyone with the right gear.

U.S. rules require planes in designated areas be equipped with ADS-B technology that broadcasts aircraft positions using signals that relatively simple equipment can pick up.

A service like Sweden-based Flightradar24 has 34,000, mostly volunteer-operated receivers around the world to pick up the signals, a key source of information that's routed back to a central network and combined with data on flight schedules and aircraft information.

Figuring out or confirming to whom a plane actually belongs can require some sleuthing, said jet tracker Jack Sweeney, who filed a public records request with the U.S. government that yielded a form bearing the signature of a particular plane's owner: Tesla boss Elon Musk.

Sweeney has gotten quite a bit of attention with his Twitter account that tracks the...