The text reads: "Old Elongated Muskrat is buying a new G700 because he's tired of that guy on Twitter tracking the flights of his 650. My manager was f---ing giddy making these for him."
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Insider could not verify who took the image that Sweeney shared with Insider.
Musk and Gulfstream did not respond to Insider's request for comment.
He also owns two Gulfstream G550s, which are registered to Falcon Landing LLC, a shell company with ties to Space X, the FAA registry shows.
Musk's first jet was a Dassault 900B. Records show that ownership of the jet changed in August 2017.
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