DON LEMON, HOST: Good evening everyone, and welcome. I’m Don Lemon, and this is CNN Tonight. We’re about to take a hard look at the bizarre series of events that have been piling up ever since passenger Dr. David Dao was forcibly removed from his United Airlines flight last week. Beaten, bloodied, and crying out with an eerie, banshee-like wail, Dr. Dao was dragged like an animal through the narrow aisles his plane as fellow passengers looked on in horror–all for the crime of buying a ticket to fly back home to Louisville from Chicago. But did that incident give rise to something deeper? Something sinister? Tonight on CNN Tonight, we will attempt to find some answers. . .and perhaps finally solve the mystery of what we’re calling. . .the Curse of United Express Flight 3411.