The videos taken on the plane and posted to Twitter showed the man -- identified by US media as a doctor of Vietnamese descent who has lived in the US for decades -- being forcibly pulled screaming from his seat by three security personnel.
The incident occurred Sunday on a United Express flight from Chicago to Louisville, Kentucky. Such flights are operated by one of eight regional airlines that partner with United.
Smartphone video posted online showed three Chicago Department of Aviation police officers struggling with a seated middle-aged man.
He starts to scream as he is dragged off while other passengers look on -- some recording the event with their phones.
One passenger can be heard yelling, "Oh my God, look at what you did to him!"
The showdown quickly ignited social media outrage, with "United" a trending term on Twitter, Facebook and Google.
United Airlines claims to be the biggest carrier to China, with more nonstop US-China flights to more Chinese cities than any other airline, according to the company's website.
"That officer has been placed on leave effective today pending a thorough review of the situation," the statement said.
It was another example of bad press and negative social media coverage for United after an incident in late March in which two teenage girls were prevented from boarding a flight in Denver because they were wearing leggings.
The airline defended its action at the time by saying the girls were flying on passes that required them to abide by a dress code in return for free or discounted travel.
"One customer refused to leave the aircraft voluntarily and law enforcement was asked to come to the gate," United spokesman Charlie Hobart was quoted by the Chicago Tribune newspaper as saying.
United addressed the incident in a statement posted on its website yesterday.
"This is an upsetting event to all of us," said chief executive Oscar Munoz, noting that the airline was conducting a "detailed review of what happened.
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