Space has seen a number of high-profile, incredibly rich tourists in the past few months. The so-called “billionaire space race” kicked off in July, when Richard Branson rode his Virgin Galactic space plane to the upper layers of Earth’s atmosphere. Shortly after, Amazon founder Jeff Bezos rode his rocket a little further. Whether they made it to “space,” though, has been hotly debated. Most space watchers agree these short suborbital trips aren’t quite the same as getting into low Earth orbit.

There will be no debate about the Inspiration4 mission. This flight takes the crew of four higher than Bezos or Branson and is different from those flights in key ways, even if it was bankrolled by another billionaire in Isaacman.

When SpaceX announced the mission in February, Isaacman bought up the entire flight and donated three of the Crew Dragon seats to “individuals from the general public.” He offered up two seats to St. Jude Children’s Research Hospital, handpicking Arceneaux, a childhood cancer survivor who now works as a physician’s assistant at the hospital and acts as the medical officer on Inspiration4.