Indigo Partners, LLC is an American private equity firm which has a controlling interest in the American Frontier Airlines and Chilean low-cost JetSmart, as well as holding stakes in Mexican budget airline Volaris and European low-cost carrier Wizz Air, while a partnership with Enerjet is planned to launch a new Canadian ultra-low-cost carrier. Indigo Partners was co-founded by Bill Franke and has set up a number of ultra-low-cost airlines around the world. It is headquartered in Phoenix, Arizona.