It marked the debut flight of SpaceX owner Elon Musk's new orbital tourism business. Isaacman paid an undisclosed sum to fellow billionaire Musk for the flight; Time magazine has put the ticket price for all four seats at $200 million. Rival companies Virgin Galactic Holdings Inc and Blue Origin inaugurated their own private-astronaut services this summer, but those suborbital flights lasted just minutes.The Inspiration4 crew has no part to play in flying the spacecraft, which is operated by ground-based flight teams and onboard guidance systems, even though two crew members are licensed pilots.Isaacman, who is rated to fly commercial and military jets, has assumed the role of mission "commander," while Proctor, a geoscientist and former NASA astronaut candidate, has been designated as the "pilot."The crew also brought the arts with them into space."Because we're trying to open the frontier for more people and open up space to more humans, or we're going to be bringing more of our humanities with us," Chris Sembroski said. "And so along with art and music, and so we have this custom ukulele that was made."Sembroski then serenaded the crew and audience with a quick melody.