In this May 15, 2015, file photo, United Airlines Chairman, President and Chief Executive Officer Jeff Smisek, speaks during a panel discussion on unfair international competition at the National Press Club in Washington. United Airlines said Tuesday, Sept. 8, 2015, that Smisek has stepped down as CEO, chairman and president effective immediately and has named Oscar Munoz as president and chief executive officer.  (AP Photo/Manuel Balce Ceneta, File) Photo: Manuel Balce Ceneta, STF / AP