The passenger who was forcibly removed from a United Airlines flight by aviation security officials Sunday garnered much public sympathy in the days since video emerged of him being dragged, bloody and screaming, down the aisle of a plane. David Dao, 69, retained a lawyer and filed a petition with an Illinois court to get all evidence related to the incident preserved. While a lawsuit wasn't filed, Dao’s lawyer confirmed in a press conference Thursday there would likely be one, which begs the question: In the wake of such a high-profile, controversial incident, how much will Dao get? “Dr. Dao...