Question: Atlantic Southeast Airlines is a subsidiary of a company headquartered in what city?

Context paragraphs:
Atlantic Southeast Airlines Flight 2311: Atlantic Southeast Airlines Flight 2311 was a regularly scheduled commuter flight from Hartsfield–Jackson Atlanta International Airport to Glynco Jetport (since renamed Brunswick Golden Isles Airport) in Brunswick, Georgia on April 5, 1991.  The flight, operated using a twin-turboprop Embraer EMB 120 Brasilia, crashed just north of Brunswick while approaching the airport for landing.  All 23 people aboard the plane were killed, including passengers Sonny Carter and John Tower.  Four years later, another Embraer Brasilia of ASA crashed in the Georgia countryside in similar circumstances, with nine fatalities.

Business Express Airlines: Business Express Airlines (IATA: HQ) , often referred to as Business Express or BizEX, was an American regional airline founded as Atlantic Air in 1982.  In an effort to appeal to its predominantly business commuter clientele, the airline assumed the Business Express name in 1985.  In 1986 Pilgrim Airlines (Groton/New London), which itself had acquired NewAir (New Haven) about a year prior, was acquired by the airline.  This opened the valuable New York and Washington, D.C. markets.  Shortly thereafter, Business Express became one of Delta Air Lines's first Delta Connection carriers, along with Atlantic Southeast Airlines, Comair and SkyWest Airlines.

Atlantic Southeast Airlines: Atlantic Southeast Airlines (ASA) was an American airline based in the A-Tech Center in College Park, Georgia, flying to 144 destinations as a Delta Connection carrier and, as of February 2010, commenced service as a United Express carrier.  It was a wholly owned subsidiary of SkyWest, Inc. ASA operated nearly 900 flights each day.  Its main hub was at Hartsfield-Jackson Atlanta International Airport (ATL).  ASA changed its name to ExpressJet in 2011.

SkyWest, Inc.: SkyWest, Inc. (NASDAQ: SKYW ) is the holding company for two scheduled passenger airline operations, SkyWest Airlines and ExpressJet, and an aircraft leasing company and is headquartered in St. George, Utah, USA.

Freedom Airlines: Freedom Airlines, Inc. was an American FAA Part 121 certificated air carrier operating under air carrier certificate number FDKA087K issued on April 1, 2002.  The Nevada Corporation was headquartered in Irving, Texas and a subsidiary of Mesa Air Group.  It operated flights as Delta Connection for Delta Air Lines serving Delta's hub at Cincinnati/Northern Kentucky International Airport in Hebron, KY, near Cincinnati, OH using EMB 145 aircraft.  Freedom's base moved to Cincinnati from New York City in July 2009.  Freedom previously operated the CRJ-900 aircraft for Delta Connection as well, however, this contract was canceled and all aircraft were transferred to Eagan, MN-based Mesaba Airlines, Atlanta, GA-based Atlantic Southeast Airlines, and Pinnacle Airlines.

Southeastern Airlines: Southeastern Airlines was a regional airline that was acquired by Atlantic Southeast Airlines, a Delta Connection carrier, on April 1, 1983.  It was formed in 1982 by Atlanta entrepreneur Michael J. Brady, who had formerly been head of Eastern Metro Express, a feeder for Eastern Airlines.

Southeast Airlines Flight 308: Southeast Airlines Flight 308 was an American domestic flight operated by Southeast Airlines between Knoxville and Bristol, Tennessee, in the United States.  On 8 January 1959 it was flown by a Douglas DC-3A registered "N18941".  On approach to Tri-Cities Regional Airport at Bristol, the aircraft crashed into the Holston Mountain range with the loss of all on board.

Atlantic Southeast Airlines Flight 2254: On April 9, 1990, Atlantic Southeast Airlines flight 2254 from Muscle Shoals, Alabama to Gadsden, Alabama to Atlanta, Georgia was involved in a mid-air collision with a Cessna 172 over Gadsden resulting in the death of the pilot and passenger of the Cessna 172.

Atlantic Southeast Airlines Flight 529: Atlantic Southeast Airlines Flight 529 (Callsign: ACEY 529) was an Embraer EMB 120 Brasilia aircraft that crashed near Carrollton, Georgia on August 21, 1995.  Nine of the 29 passengers and crew on board were killed as a result of the accident.  The accident bore similarities with Atlantic Southeast Airlines Flight 2311, which had occurred four years earlier, and resulted in the deaths of everyone on board.

Southeast Airlines: Southeast Airlines was a low fare public charter airline in the United States, headquartered in Largo, Florida, operating regular service to various vacation/leisure destinations using eight McDonnell Douglas DC-9-30 and two McDonnell Douglas MD-80 aircraft.  It abruptly ceased operations on November 30, 2004.  The airline was featured on "The Simple Life" reality TV series, which Southeast executives hoped would give the carrier some exposure.  The airline's jets featured the "Sun King" logo previously used by the original National Airlines which appeared on the tails of its aircraft.

Supporting paragraphs: Atlantic Southeast Airlines SkyWest, Inc.
Answer: St. George, Utah