United Airlines and the City of Chicago have agreed to preserve the evidence requested for a possible lawsuit related to the brutal removal of a passenger on April 9, said the passenger's lawyer on Saturday.

A hearing for the petition scheduled for next week "will not take place," said Thomas Demetrio, attorney for the passenger David Dao, in an email.

Demetrio filed the petition on behalf of Dao, the 69-year-old Vietnamese American doctor who was violently removed by Chicago aviation security officers from one United flight at O'Hare International Airport to make room for its own crew members.

Dao suffered concussion, broke his nose, and lost two front teeth, said his attorney on Thursday.

The video of this bloody incident went viral and sparked social media uproar, in which many echoed a call to boycott the airline.

Facing public outrage, United finally apologized and promised that this kind of incidents would never happen again.

It is not clear if the United would like to choose a settlement or go to court. The City of Chicago could also be sued, as the aviation security officers were hired by the city.