According to documents obtained by ABC News, Dao and his wife initially expressed interest United's offer to bump passengers in exchange for an $800 voucher but declined after learning they were not guaranteed a flight the same day.
When none of their fellow passengers volunteered for reaccommodation, the Daos were informed they had been selected to involuntarily surrender their seats. They refused, and a United supervisor summoned security officers.
Described in aviation department reports as "aggressive" and "combative," David Dao repeatedly rejected officers' orders to exit, saying, "I don't care if I get arrested."
According to the reports, when officers attempted to extricate him from his seat, he allegedly flailed his arms, hitting his mouth on an armrest during the struggle. Because he "would not stand up," a Chicago aviation official said in one report, officers removed him "by dragging him."
After his forcible removal, Dao ran back onto the aircraft — his face apparently bloody — and was removed once again a short time later via stretcher.
After the altercation went viral, four Chicago aviation officers were placed on paid administrative leave.
"Our review shows that many things went wrong that day, but the headline is clear: Our policies got in the way of our values," Munoz said in a statement distributed today alongside a report from the incident review. "Our customers should be at the center of everything we do, and these changes are just the beginning of how we will earn back their trust."
In the days after the incident, United pledged to never again summon law enforcement to forcibly remove a paying customer from an aircraft, except for security reasons — a promise reiterated in today's report.
The report outlined 10 policy changes resulting from the Dao incident, including some previously reported by ABC:
Involuntary denial of boarding incidents like Dao's are among the most difficult situations for gate agents and other employees, United said in the report.
According to company statistics submitted to the Department of Transportation, the vast majority of passengers denied boarding gave up their seats voluntarily, in exchange for travel vouchers or other incentives. Less than 1 in 23,000 customers is involuntarily denied boarding, the airline said, and many of those are kept off the plane because of weight restrictions, aircraft downsizing or security concerns. Only a handful are kept from boarding because of overbooking or crew positioning issues, according to United.
Dao's flight was overbooked and had crew positioning issues, United said in its report. (Previously, United disputed reports that the flight was overbooked, saying the incident stemmed only from crew movement problems.) One passenger who had not yet received a seat assignment was involuntarily bumped before boarding, and two more were booted from their seats to make room for United crew members displaced from another flight by maintenance issues.
"This has been a defining moment for our United family," the report said. "It is our responsibility — our mission — to make sure we all learn from this experience."