Flybe Group Plc, Europe’s biggest regional airline, appointed Christine Ourmieres-Widener as its chief executive officer, succeeding Saad Hammad, who stood down in October after struggling to lift earnings. Ourmieres-Widener, an executive at Air France before she ran fellow regional operator CityJet Ltd. between 2010 and 2015, takes over Jan. 16, Flybe said in a statement Tuesday.