But it’s not entirely clear how such untrained and untested folks will react. “It’s just an unknown,” says MacCallum. “We’ve talked to doctors about it, flight surgeons, and the consensus is: Who knows? Nobody’s ever taken a person to the stratosphere who wasn’t trained.” That’s partly why both companies plan to have two pilots on a crew; one will always be available to “deal with” passengers’ reactions, should the need arise.