Biographer Walter Isaacson and others close to Musk have previously described Musk’s periods of extreme productivity—and extreme temper—as “demon mode.”

Boeing has lost more than $2 billion producing the Next Air Force One after President Donald Trump renegotiated the deal in his first term.

Elon Musk is working with Boeing on behalf of President Donald Trump in order to speed up replacements for the president’s planes, known as Air Force One, that are over budget and behind schedule.