Five weeks after being named CEO of United Airlines, Oscar Munoz had a heart attack. Two months later, with a new heart, he was back at work, where he was faced with a company in disarray. Over the course of the following year, Munoz largely succeeded in turning around the airline. He recently sat down with Carlyle Group co-founder David Rubenstein. They spoke on David Rubenstein's Bloomberg Television program, "Peer to Peer conversations."