According to the Contract of Carriage, United can refuse to transport or has the right to remove passengers from the aircraft at any point for any of the following reasons: (These are just a few of the listed reasons.)
Passengers who appear to be intoxicated or under the influence of drugs to a degree that the passenger may endanger themselves, another passenger or members of the crew
Passengers who are barefoot or not properly clothed
Pregnant passengers in their ninth month, unless the passenger provides a doctor's certificate dated no more than 72 hours prior to departure stating that the doctor has examined and found the passenger to be physically fit for air travel to and from the destination and that the estimated delivery date is after the date of the last flight
Unaccompanied passengers who are both blind and deaf, unless the passenger is able to communicate with the representatives of United by other methods
Passengers who are unwilling to follow United's policy that prohibits voice calls after the aircraft doors have closed, while taxiing before takeoff or while airborne
Passengers wearing or possessing concealed or unconcealed deadly or dangerous weapons
Passengers who are unwilling or unable to follow United's policy on smoking or use of other smokeless material
Passengers who refuse to produce satisfactory proof of identification or those who present identification that does not match the name of the ticket
Passengers who exhibit disorderly, offensive, abusive or violent conduct
Passengers who fail to comply with or interfere with the duties of the flight crew members, federal regulations or security directives
Passengers who assault any passengers or United employees, including the gate agents and flight crew
Passengers who cause a disturbance such that the captain or member of the cockpit crew must leave the cockpit to attend to the disturbance
Government request, regulations and security directives
Failure to comply with the rules of the Contract of Carriages
http://www.kcra.com/...reasons/9261454
And then there is the ambiguous "interfering with a flight crew".
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