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- Twitter staff monitored @Elonjet in order to anticipate Elon Musk's office visits, according to a new book.
- The account tracked Musk's flights between Twitter HQ and SpaceX's office.
- Musk has spoken out against jet-tracking in the past.
Elon Musk's fans aren't the only ones monitoring the billionaire's private jet movements. Twitter staff also took to watching a social-media account that tracks Musk's planes, according to a new book about the company.