 On 6 April 2009, CEO Dermot Mannion announced his resignation from the airline after four years as Chief Executive.He was replaced by German-born Christoph Müller (alternative spelling "Mueller"), former head of TUI Travel and Sabena, who joined Aer Lingus on 1 October 2009.On 2 December 2009, Aer Lingus announced that talks with its unions had broken down.