Elon Musk reached out to a 19-year-old last fall over a Twitter direct message to ask him to stop tracking his flights, according to a report by Protocol.

Since June 2020, the Twitter handle @ElonJet has been tracking Elon Musk’s private jet with a bot using public data from the Federal Aviation Administration. @ElonJet will regularly provide updates on the location of the jet, for example saying that it landed in Austin after a six-hour flight.

The account has over 90,000 followers and regularly gets several hundred likes per tweet.