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?
Context: 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.  A McDonnell Douglas DC-10-10 used for this flight on May 25, 1979, crashed moments after takeoff from Chicago.  All 258 passengers and 13 crew on board were killed, along with two people on the ground.  It is the deadliest aviation accident to have occurred in the United States. United Express Flight 6291 was a regularly scheduled United Express flight from Washington D.C. to Columbus, Ohio.  It was a service operated by Atlantic Coast Airlines on behalf of United Express. Air Wisconsin Airlines is a regional airline based at Appleton International Airport in the town of Greenville, Wisconsin, United States, near Appleton.  Air Wisconsin is the largest privately held regional airline in the United States.  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) .  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.  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. 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.  It is headquartered in Indianapolis, Indiana.  Its call sign "Brickyard" is derived from the nickname of the Indianapolis Motor Speedway. Bishop International Airport (IATA: FNT, ICAO: KFNT, FAA LID: FNT) is a commercial and general aviation airport located in Flint, Michigan.  It is named after banker and General Motors board member Arthur Giles Bishop (April 12, 1851 – January 22, 1944), who donated 220 acres of his farmland for the airport in 1928.  The third busiest airport in Michigan, it surpassed competitor MBS International Airport in terms of airline operations in 2002.  In 2007, 1,071,238 passengers used Bishop International Airport; in 2011, 938,914 passengers used the airport.  It is included in the Federal Aviation Administration (FAA) National Plan of Integrated Airport Systems for 2017–2021, in which it is categorized as a small hub primary commercial service facility.  The airport is currently served by several passenger airlines: Allegiant Air, Southwest Airlines and Delta Air Lines operate mainline service out of the airport, as well as affiliates of Delta Connection, United Express and American Eagle.  Additionally, FedEx Express and a FedEx Feeder affiliate operate cargo services out of the airport.  Accompanying the airlines is fixed-base operator Av Flight that handles both general aviation and airline operations and the flight school American Wings Aviation.  Bishop International Airport is in southwestern Flint, and is surrounded by Flint Township to the north, east and west; and Mundy Township to the south. GoJet Airlines LLC is a company headquartered in Bridgeton, Missouri, United States.  Wholly owned by Trans States Holdings, it has 1670 employees.  It operates commuter feeder services under the United Express and Delta Connection names.  Go Jet Airlines has crew bases at Lambert-Saint Louis International Airport, O'Hare International Airport, Denver International Airport, and Raleigh-Durham International Airport.  Flights are currently operated out of United's hubs at O'Hare International Airport and Denver International Airport, as well as Lambert-Saint Louis International Airport.  GoJet's Delta Connection flights currently operate out of Lambert-Saint Louis International Airport , Detroit Metropolitan Airport and Raleigh-Durham International Airport.  Its call sign "Lindbergh" is named after aviation pioneer Charles Lindbergh, who flew the "Spirit of St. Louis" solo across the Atlantic Ocean in 1927, the first person to do so. United Express Flight 2415 was a regularly scheduled flight from Seattle to Pasco, Washington, operated using a BAe Jetstream 31.  On December 26, 1989, Flight 2415 crashed while attempting to land at Pasco's Tri-Cities Airport, killing both pilots and all four passengers aboard. United Express Flight 5925, operated by Great Lakes Airlines with a Beechcraft 1900 twin turboprop, was a regularly scheduled flight from Chicago O'Hare International Airport to Quincy, Illinois, with an intermediate stop in Burlington, Iowa. Trans-Colorado Airlines Flight 2286 (operating as Continental Express Flight 2286) was a scheduled domestic passenger flight from Denver, Colorado, to Durango, Colorado, operated for Continental Express by Trans-Colorado Airlines.  On January 19, 1988, Flight 2286 crashed onto terrain near Bayfield, Colorado, while on approach to Durango-La Plata County Airport.  Out of the 17 people on board, 9 were killed, including both crew members. 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.  Dao screamed as officers pulled him out of his seat, and his face hit an armrest during the struggle.  Officers then dragged him, apparently unconscious, by his arms on his back along the aircraft aisle past rows of onlooking passengers.  He was later seen with blood around his mouth.  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.  Four passengers were then selected for involuntary removal from the flight.  Three other passengers complied, and Dao was selected to be fourth.  Republic Airline operated the scheduled passenger flight on behalf of United Express, a United Airlines regional branch.
Answer: Republic Airline Inc.