Elon Musk's private jet is no longer appearing on a widely used public tracking system

• Musk earlier this week suspended Twitter accounts showing his private jet travel.
• Now, the billionaire seems to have blocked his private plane from public view altogether.
• Data for Musk's flights has for years been available due to a federal mandate covering aircrafts. 

Elon Musk may have taken an additional step to keep his private jet travels away from public view.

His Gulfstream jet, registered through an LLC he owns, could be seen having landed on Wednesday evening in Austin through an online tracker, ADS-B Exchange. On Thursday the jet was not available for view.

The billionaire and new Twitter owner has likely opted in to a program offered by the Federal Aviation Association called Limiting Aircraft Data Displayed, or LADD, that prevents much of his previously available flight paths from being tracked.

On Thursday, Musk's jet showed up on a widely used public tracking system with a note that it is part of the LADD program.

The program is part of a privacy bill that allows the FAA to "upon request of a private aircraft owner or operator, block the registration number of the aircraft from any public dissemination or display, except in data made available to a Government agency, for the noncommercial flights of the owner or operator." So, Musk's flight information will now only be available to the government as necessary.

A spokesperson for the FAA and ADS-B Exchange did not immediately respond to a request for comment. 

The cities where Musk's private jet lands has for years been openly accessible for public viewing through sites that receive and track flight data that is mandated to be transmitted by the FAA. 

Earlier this week, Musk suspended a Twitter account of a 20-year old student, Jack Sweeney, who created a tool that automatically posted flights the billionaire took on his jet. Musk also suspended Sweeney's personal Twitter account and is now threatening "legal action" against him. He said the cities where his jet lands being made available on Twitter threatened the safety of his family.

After implementing the suspensions, Twitter changed its rules to state that the posting of a person's "live location" is now prohibited, despite a history of live posting, video and events being core to Twitter's function and appeal as a platform. Twitter also suspended more than 30 other accounts that similarly used public flight data to track private jet travel of notable billionaires and political figures, like Facebook founder and CEO Mark Zuckerberg and Russian President Vladimir Putin.

Other notable billionaires have taken pains to keep their flight data inaccessible by the public. Google co-founder Larry Page is also part of the LADD program and frequently uses rental jets in order to keep his travels more secret, as Insider reported. Bernard Arnault, the co-founder and CEO of luxury fashion group LVMH, earlier this year sold his private jet and began using rentals to avoid his flights being made public.

In addition to private jet tracking showing where the ultra-wealthy are travelling to, accounts like Sweeney's that posted about the flights noted how long they were and how much air-pollution such trips created. Private planes are known to be 14 times more pollutive per passenger than a commercial flight, creating 2 metric tons of carbon per hour. Musk's plane in august took a 9-minute flight from San Jose to San Francisco. 

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