Who knows what the whole story is. But if someone denies the denies boarding when already on the airplane, eventually this is the outcome. There's no choice but to physically remove the passenger. Seeing the last video, it appears this man has mental issues. Maybe that was not apparent before they pulled him off. I wonder if he's even doctor, and if that wasn't made-up to stay on the plane.

UA Mainline has no scheduled flights from SDF, and I can't find one for today either. Also, they say 4 crew members. Every mainline crew is a minimum of five. For how massively unreliable the media is, they probably have it also wrong that it was a UA crew that needed to board. Could have been another Republic crew. If this is how Republic conducts operations with crew deadheads, this could have happened to any airline they work, including AA and DL.