(CNN) -- Dr. David Dao, the passenger forcefully removed from a United Airlines flight earlier this week, has filed a lawsuit against the airline, according to a filing listed on the Cook County Clerk of Circuit Court website.
Dao, 69, suffered "a significant concussion as a result of disembarking that plane," attorney Thomas Demetrio said in a Thursday news conference. Dao also lost two front teeth, has a broken nose and incurred injuries to his sinuses, and will be "undergoing reconstructive surgery in that regard," Demetrio said.
Demetrio added he believes airlines "bully" their customers. He also said in this particular case, United Airlines is not only to blame but the city of Chicago as well, as police officers were who pulled Dao off the flight.
At the same press conference, Dao's daughter Crystal Pepper said her family was "completely horrified and shocked" upon seeing video of her father being violently dragged off of the airplane.