William A. Franke has been a principal of Indigo Partners, which he joined in September 2000. Mr. Franke served as chief executive officer of Frontier Airlines from July 2010 to August 2021 and as chairman of the board of Frontier Airlines from August 2021 to December 2024. Mr. Franke was also involved in a predecessor of America West Airlines, from 1992 to 2001 and chief executive officer of America West Airlines from 1993 to 2001. He has served as chair of the boards of directors of Wizz Air Holdings Plc (Wizz Air), an airline based in Europe, since 2004, JetSMART Holdings Limited, the parent company of an airline based in South America, since February 2017, and APiJET, LLC (APiJET), a software company focused on providing real-time cost saving analytics to airlines, since November 2020, and previously served as chair of the board of directors of Lynx Air Holdings Corporation (Lynx Air), formerly Enerjet Holdco, Inc., the holding company of an airline based in Canada, from December 2018 to December 2023. Mr. Franke also served on the board of directors of Concesionaria Vuela Compa a de Aviaci n, S.A.B. de C.V., an airline based in Mexico doing business as Volaris, from July 2010 to April 2023, at which point, Mr. Franke was appointed as an honorary director without being a part of the board of directors. He previously served as chair of Spirit Airlines, Inc. (Spirit) from 2006 to 2013 and Tiger Aviation Pte. Ltd (Tiger Aviation), a Singapore-based airline, from 2004 to 2009, and as a member of the boards of directors of Alpargatas S.A.I.C., an Argentina-based footwear and textiles manufacturer, from 1996 to 2007, and Phelps Dodge Corporation (now known as Freeport-McMoRan Inc.), a mining company, where he served as the lead outside director for several years, from 1980 to 2007. He also previously served on a number of other boards of directors, including ON Semiconductor, Valley National Corporation, Southwest Forest Industries, Circle K Corporation, and Beringer Wine Estates Holdings, Inc. Mr. Franke holds a B.A. and a LLB from Stanford University and honorary doctorates from Northern Arizona University and the University of Montana. We believe Mr. Franke is qualified to serve on our Board due to his private equity experience in the air transportation industry, his prior directorships, his financial literacy, and his general airline and business experience.