Six Flags Entertainment Corp. /zigman2/quotes/208050417/composite SIX -0.55% said late Thursday it has appointed Mike Spanos as its president and chief executive officer, effective Nov. 18. Spanos will also be a member of the board of directors, effective immediately. Spanos most recently served as chief executive officer of PepsiCo Inc's /zigman2/quotes/208744353/composite PEP -0.93% Asia, Middle East and North Africa unit and had been with PepsiCo since 1993. Jim Reid-Anderson, chairman, president and CEO, will resign as a director and an officer of the company on Nov. 18, and on that date Richard Roedel, who has been a board member since 2010, will be appointed non-executive chairman of the board. Shares of Six Flags fell 0.2% in the extended session Thursday, after ending the regular trading day down 1.6%. The company earlier this week reported third-quarter earnings and sales that missed Wall Street expectations.