NEW YORK (CNNMoney) – The court system could now get involved in the United Airlines fiasco.
Dr. David Dao, who was dragged off a plane in Chicago last Sunday, hasn't said whether he'll file a lawsuit.
But his lawyers filed an emergency petition on Wednesday asking that all potential evidence from the episode be preserved. Dao's legal team and his family members will hold a press conference on Thursday.
If Dao does file suit, either against United or the Chicago authorities who manhandled him, he has a good case, legal experts say.
As everyone now knows, Dao was pulled off a plane, bloodied and screaming, at Chicago O'Hare International Airport. He had refused to give up his seat on a flight to Louisville, Kentucky. United needed to free up seats for commuting crew members.
Trial lawyer Aaron Podhurst, who represents plaintiffs in aviation cases, said he believes Dao can make a strong civil case based on the assault and battery that appears to have occurred. United could be liable, and Dao could also sue Chicago authorities for use of excessive force, Podhurst said.
"This case is a very strong case for the passenger," Podhurst said. He added that he expects Dao would be able to secure a settlement.
Passengers agree to a litany of terms in any airline's "contract of carriage," which they agree to when purchasing a ticket. But the agreement doesn't sign away the right to sue if the airline treats a passenger in a manner that breaches the law.
"If you're injured, or dragged off the airplane, or falsely arrested, you can sue," said Andrew Harakas, head of the aviation law group at Clyde & Co.
United declined to comment. Dao's lawyer, Stephen Golan, also did not respond to a request for comment.
Airlines do have legal protection if they act in a reasonable way when refusing to transport a passenger that is a threat to himself or other passengers, Harakas said.
David Katzman, an aviation lawyer with Katzman Lampert & McClune, said that standard doesn't likely apply in the United case.
"You could give this to a group of first-year lawyers and they could list all the claims this guy has," he said, naming intentional infliction of emotional distress in addition to assault and battery.
United CEO Oscar Munoz initially said that Dao was "disruptive and belligerent." But on Wednesday, Munoz walked back such language, saying he did not blame Dao for what happened. He told ABC that United did not give its managers "the proper tools, policies, procedures."