Earlier on Thursday, United announced several steps to prevent such episodes from recurring and said that passengers who had arrived on an aircraft shouldn’t have to give up their seats. The airline said it would create a new check-in process that would allow passengers to volunteer to give up their seats for compensation, and increased the limit of that compensation to $10,000 from $1,350.

United had previously announced that it would no longer ask law enforcement officers to remove passengers from its planes over booking issues, and that crew members would not replace boarded passengers.

“I hope other airlines will follow United’s lead,” Mr. Demetrio said in an interview on Thursday. “I have gotten an amazing number of emails from people with tales of woe, and it was not limited to United Airlines. So passenger service is an industrywide issue, and here United has laid the groundwork for the other airlines on what needs to be done.”

“I’ve read enough of people’s issues with the airlines to see that it’s real simple if the passengers are just treated kindly, even if they’re not always right,” he added.

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Faced with a public relations crisis, United has offered a series of intensifying apologies since Dr. Dao suffered a concussion and a broken nose, and lost two teeth, as he was forcibly removed from a flight he had paid for. United said it needed the seat for an airline employee.

Mr. Demetrio said that Dr. Dao is planning to have surgery on his nose. He also said that he believed that United never had any legal basis to remove Dr. Dao from his seat.

A United report released on Thursday suggested the airline needs to become more customer-friendly. The company said it plans to reduce how many flights it overbooks — a common airline practice that ensures there are as few empty seats as possible — and create a call center to handle overbooking problems.

It also said it would pay customers $1,500 if it loses their bags.

The uproar may have cost Mr. Munoz a planned promotion to the role of chairman of the company that runs United Airlines. United Continental Holdings said last week it would adjust its compensation program for senior executives to make it “directly and meaningfully tied to progress in improving the customer experience.”

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