A billionaire’s private SpaceX flight filled its two remaining seats Tuesday with a scientist-teacher and a data engineer whose college friend actually won a spot but gave him the prize.

The new passengers: Sian Proctor, a community college educator in Tempe, Arizona, and Chris Sembroski, a former Air Force missileman from Everett, Washington. They will join flight sponsor Jared Isaacman and another passenger for three days in orbit this fall.  Isaacman is a pilot who will serve as spacecraft commander. He’s donating $100 million to St. Jude, while donors so far have contributed $13 million, primarily through the lottery that offered a chance to fly in space.

Hayley Arceneaux, 29, was named to the crew a month ago. She is a physician assistant at St. Jude who was treated there as a child for bone cancer.

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