I hate to be the one to point this out, but this is a case where people vote with their wallets for the absolute cheapest product, and then are angry to get what they paid for. They buy discounted non-refundable inflexible strings-attached fares, and then are shocked to discover than when push comes to shove, strings are attached (such as lowest priority on rebooking). If you absolutely need to get there on time, or…
The CEO remarked: The man was removed because employees were following the “involuntary denial of boarding process.” How do you deny boarding to someone who is already boarded?
United says its denial of boarding provisions only apply in the event of an “oversold flight." United defines oversold flights as:
> A flight where there are more Passengers holding valid confirmed Tickets that check-in for the flight within the prescribed check-in time than there are available seats.
Employees are not considered "passengers holding valid confirmed tickets that check-in for the flight within the prescribed check-in time." To reinforce this reality, the CEO admitted that the flight was not oversold.
But most importantly, there are different laws for customers pre-board and after you've board the plane. There's a very specific set of rules that allow United to kick a boarded passenger off a plane(Rule 21 Refusal of Transport), but there's overwhelming evidence that none of it applied to Dr. Dao.