Lawyer Thomas Demetrio (L), who is representing David Dao, the passenger who was violently dragged off an overbooked United Airlines flight, speaks as lawyer Stephen Golan (C) and Dao's daughter Crystal Dao Pepper look on during a press conference in Chicago, Illinois, the United States, on April 13, 2017. The passenger who was violently dragged off an overbooked United Airlines flight on Sunday night may file a lawsuit against the company, his lawyer Tom Demetrio said at a press conference Thursday. (Xinhua/Wang Ping)
