Four Private Citizen's orbit Earth for three days. Inspiration4 is facing a 24-hour launch window. Hayley Arceneaux, a physician assistant at St. Jude Children's Research Hospital, where she was once a patient. First person to fly to space with a metal rod in her leg to replace bone removed during surgery. Sian Proctor, a geosciences professor in Arizona, who has dreamed of going to space since she was a child. Chris Sembroski, an Air Force Veteran. Jared Isaacman, a billionaire who founded Shift4 Payments and purchased the flight.