United Airlines CEO Oscar Munoz on Tuesday apologized to the United States Congress for his company causing a passenger to be dragged off a UA flight last month. United failed its customers and failed as a company in that incident, and this has to be a turning point for the airline, Munoz told the U.S. House of Representatives Transportation Committee at a hearing into airline industry practices. United should not have called on law enforcement to drag the passenger, David Dao, off the plane, Munoz told the committee.