Question: John W. Creighton Jr. (born 1933) is an American executive who has worked with many corporations, organizations, and universities, these include which major U.S. airline headquartered in Chicago, Illinois?

Context paragraphs:
SkyMiles: SkyMiles is the frequent-flyer program of Delta Air Lines that offers points (or "miles") to passengers traveling on most fare types, as well as to consumers who utilize Delta co-branded credit cards, which accumulate towards free awards such as airline tickets, business and first class upgrades, and luxury products.  Created in 1981 as the "Delta Air Lines Frequent Flyer Program"; its name was changed to SkyMiles in 1995.  Delta claims that it is the only major U.S. airline without mileage expiration, so travelers can redeem awards at their leisure.  The airline also has a separate SkyBonus program that provides small to mid-sized business owners with a way to earn points for trips taken by employees, good towards free flights, upgrades, Silver Medallion status and other travel awards.

America West Airlines: America West Airlines was a U.S. airline headquartered in Tempe, Arizona.  Their main hub was at Sky Harbor Airport in Phoenix, Arizona, with a secondary hub at Las Vegas McCarran International Airport in Las Vegas, Nevada.  The airline became part of the US Airways Group after it acquired the larger airline in 2005 and adopted the US Airways brand name.  America West was the second largest low-cost carrier in the U.S. after Southwest Airlines and served approximately 100 destinations in the US, Canada, and Mexico.  Service to Europe was provided through codeshare partners.  In March 2005, the airline operated a fleet of 132 aircraft, with a single maintenance base at Sky Harbor Airport in Phoenix.  Regional jet and/or turboprop feeder flights were operated on a code sharing basis by Mesa Airlines and Chautauqua Airlines as America West Express.

Southwest Airlines: Southwest Airlines Co. () is a major U.S. airline and the world's largest low-cost carrier headquartered in Dallas, Texas.

Northwest Airlines fleet: Northwest Airlines was a major U.S. airline which existed from 1926 until 2010, when it merged with Delta Air Lines.  At the time of the merger it had a total of 320 aircraft with seven on order.  It was also the last U.S. airline to have a dedicated cargo fleet and routes.

The Loop (U.S. TV series): The Loop was an American sitcom that ran from March 15, 2006 to July 1, 2007 on Fox.  The show starred Bret Harrison as Sam Sullivan, a young professional trying to balance the needs of his social life with the pressures of working at the corporate headquarters of TransAlliance Airways, a major U.S. airline.  Set in the city of Chicago, whose downtown loop area acted as the setting for most of the show.  The show's theme song is "Hockey Monkey" by James Kochalka Superstar and the Zambonis.

John W. Shannon: John W. Shannon (born 1933) was United States Under Secretary of the Army from 1989 to 1993.

JetAmerica: Sun America, Inc., d/b/a JetAmerica, was a proposed American low-cost scheduled public charter airline headquartered in unincorporated Pinellas County, Florida.  On March 10, 2009, the airline announced a number of public scheduled charter flights from underutilized airports to Newark and Minneapolis–St. Paul using a Miami Air International Boeing 737-800 to begin on June 30, 2009.  On May 27, 2009, the airline held its first press conference at Toledo Express Airport, Ohio, announcing its first focus city and the start of flight operations on July 13, 2009.  The airline announced the station markets of Lansing, Michigan; Melbourne, Florida; Minneapolis, Minnesota; Newark, New Jersey; South Bend, Indiana; and Toledo, Ohio.  The airline also publicly stated it was evaluating service to Baltimore, Maryland; Charleston, West Virginia Chicago Midway, Illinois; Rockford, Illinois; Cincinnati, Columbus, and Dayton, Ohio; Greensboro, North Carolina; Hartford, Connecticut; Pittsburgh, Pennsylvania; and Clearwater, Florida.  The airline later delayed the start of service to August 14, 2009.  However, JetAmerica did not begin service as it was unable to finalize slots at Newark.

John W. Creighton Jr.: John W. Creighton Jr. (born 1933) is an American executive who has worked with many corporations, organizations, and universities.  These include Weyerhaeuser Company, United Airlines, the University of Puget Sound, civilian aide to the Secretary of the Army, and the Boy Scouts of America (BSA).

United Airlines: United Airlines, Inc., commonly referred to as United, is a major U.S. airline headquartered in Chicago, Illinois.  It is the world's third-largest airline when measured by revenue, after American Airlines and Delta Air Lines.  United operates a large domestic and international route network, with an extensive presence in the Asia-Pacific region.  United is a founding member of Star Alliance, the world's largest airline alliance.  Regional service is operated by independent carriers under the brand name United Express.  Its main competitors are American Airlines, Delta Air Lines, and Southwest Airlines.

Google Finance: Google Finance is a website launched on March 21, 2006, by Google.  The service features business and enterprise headlines for many corporations including their financial decisions and major news events.  Stock information is available, as are Adobe Flash-based stock price charts which contain marks for major news events and corporate actions.  The site also aggregates Google News and Google Blog Search articles about each corporation, though links are not screened and often deemed untrustworthy.  Google added advertising to its finance page on November 18, 2008, which continues to be shown.  Google launched a revamped version of their finance site on December 12, 2006, featuring a new homepage design which lets users see currency information, sector performance for the United States market and a listing of top market movers along with the relevant and important news of the day.  A top movers section was also added, based on popularity determined by Google Trends.  The upgrade also featured charts containing up to 40 years of data for U.S. stocks, and richer portfolio options.  Another update brought real-time ticker updates for stocks to the site, as both NASDAQ and the New York Stock Exchange partnered with Google in June 2008.  It has not undergone any major upgrades since 2008 and the Google Finance Blog was closed in August 2012.  Enquiries and bug reports are not responded to or acted upon so it is presumed to be a discontinued service.  On September 22, 2017, Google confirmed that the website is under renovation and the portfolios feature won't be available after mid-November 2017.

Supporting paragraphs: John W. Creighton Jr. United Airlines
Answer: United Airlines, Inc.