Question: United Express Flight 3411 incident occurred on April 9, 2017, O'Hare International Airport police violently and forcibly ejected passenger David Dao from United Express Flight 3411 after he refused to depart the airplane upon the demand of management, which airline subsidiary operated the scheduled passenger flight, on behalf of United Express?

<P0-S0> American Airlines Flight 191 was a regularly scheduled passenger flight operated by American Airlines from O'Hare International Airport in Chicago to Los Angeles International Airport. <P0-S1>  A McDonnell Douglas DC-10-10 used for this flight on May 25, 1979, crashed moments after takeoff from Chicago. <P0-S2>  All 258 passengers and 13 crew on board were killed, along with two people on the ground. <P0-S3>  It is the deadliest aviation accident to have occurred in the United States. <SEP> <P1-S0>  Republic Airline operated the scheduled passenger flight on behalf of United Express, a United Airlines regional branch. <P1-S1> On April 9, 2017, O'Hare International Airport police violently and forcibly ejected passenger David Dao from United Express Flight 3411 after he refused to depart the airplane upon the demand of management. <P1-S2>  Dao screamed as officers pulled him out of his seat, and his face hit an armrest during the struggle. <P1-S3>  Officers then dragged him, apparently unconscious, by his arms on his back along the aircraft aisle past rows of onlooking passengers. <P1-S4>  He was later seen with blood around his mouth. <P1-S5>  Prior to the confrontation, managers offered travel vouchers to passengers to vacate their seats to make room for four airline employees who needed to travel to the destination, Louisville International Airport, but none of the fliers accepted. <P1-S6>  Four passengers were then selected for involuntary removal from the flight. <P1-S7>  Three other passengers complied, and Dao was selected to be fourth. <SEP> <P2-S0> Air Wisconsin Airlines is a regional airline based at Appleton International Airport in the town of Greenville, Wisconsin, United States, near Appleton. <P2-S1>  Air Wisconsin is the largest privately held regional airline in the United States. <P2-S2>  It currently operates regional jet flights as American Eagle under contract to American Airlines via a code sharing agreement, serving cities in the U.S. and Canada with hubs at Boston Logan International Airport (BOS), Charlotte Douglas International Airport (CLT), Philadelphia International Airport (PHL) and Ronald Reagan Washington National Airport (DCA) . <P2-S3>  Air Wisconsin previously operated United Express service on behalf of United Airlines followed by US Airways Express service on behalf of US Airways prior to becoming an American Eagle regional air carrier. <P2-S4>  The company has announced it will once again partner with United Airlines as a United Express code sharing air carrier with primary hubs to be located at Chicago O'Hare International Airport (ORD) and Washington Dulles International Airport (IAD) beginning in September 2017 and will be "exclusively operating" as United Express by March 2018. <SEP> <P3-S0> Republic Airline Inc., operating as Republic Airline, is a regional airline subsidiary of Republic Airways Holdings that operates service as American Eagle, Delta Connection, and United Express using a fleet of Embraer 170 and Embraer 175 regional jets. <P3-S1>  It is headquartered in Indianapolis, Indiana. <P3-S2>  Its call sign "Brickyard" is derived from the nickname of the Indianapolis Motor Speedway.