Question: What company did the executive who was onboard the September 11th flight to San Francisco work public relations for?

Context paragraphs:
Boston University College of Communication: Boston University College of Communication (COM) is a communication school within Boston University.  It was founded in 1947 as the School of Public Relations.  The College of Communication is the oldest public relations school in the United States.  Today, the school offers undergraduate and graduate degrees in three academic departments: Film and Television; Journalism; and Mass Communication (Advertising, Public Relations, Communication Studies, and Emerging Media Studies).  The school's journalism and communication programs are highly ranked nationally with its film program ranked 11th by "The Hollywood Reporter" in 2013.  The College of Communication building is just blocks from Kenmore Square and Fenway Park.

United Airlines Flight 93: United Airlines Flight 93 was a domestic scheduled passenger flight that was hijacked by four Al-Qaeda terrorists on board, as part of the September 11 attacks.  It crashed into a field in Somerset County, Pennsylvania, during an attempt by the passengers and crew to regain control.  All 44 people aboard were killed, including the four hijackers, but no one on the ground was injured.  The aircraft involved, a Boeing 757–222, was flying United Airlines' daily scheduled morning flight from Newark International Airport in New Jersey to San Francisco International Airport in California.

Pendleton Dudley: Pendleton Dudley (September 8, 1876 – December 10, 1966) was an American journalist and public relations executive.  Once considered the "dean of public relations", he is best known as the long-time outside publicity counsel to AT&T and as a founder of the predecessor organizations to the Public Relations Society of America and the Institute for Public Relations.  He was the father of the choreographer Jane Dudley and was the husband of the motorist Hermine Jahns.

Tony Wyllie: Tony Wyllie (born December 31, 1967) is a Senior Vice President for the Washington Redskins.  He has previously worked as an Assistant Director of Public Relations for the St. Louis Rams, the Director of Public Relations for the Tennessee Titans, and Vice President of Communications for the Houston Texans.  He is a five-time recipient of the Pro Football Writers of America Pete Rozelle award for public relations, and the only executive to receive it for their work on three different teams.

Theodore Wores: Theodore Wores (August 1, 1859–September 11, 1939) was an American painter born in San Francisco, son of Joseph Wores and Gertrude Liebke.  His father worked as a hat manufacturer in San Francisco.  Wores began his art training at age twelve in the studio of Joseph Harrington, who taught him color, composition, drawing and perspective.  When the San Francisco School of Design opened in 1874, Wores was one of the first pupils to enroll.  After one year at that school under the landscape painter Virgil Macey Williams, he continued his art education at the Royal Academy in Munich where he spent six years.  He also painted with William Merritt Chase and Frank Duveneck.  Wores returned to San Francisco in 1881.  He went to Japan for two extended visits and had successful exhibitions of his Japanese paintings in New York City and London, where he became friends with James Abbott McNeill Whistler and Oscar Wilde.  He visited Hawaii and Samoa in 1901-1902 and established a home in San Francisco about 1906.  He visited Hawaii for a second time in 1910–1911.  He was married in 1910 in San Francisco to Carolyn Bauer.  For the remainder of his career, Wores painted the coast on the western edge of San Francisco.  He died from a heart attack in San Francisco Sept. 11, 1939.

MWWPR: MWWPR (formerly MWW) is a public relations firm.  The company works in public relations and marketing, technology, digital and social media marketing, public affairs and government relations, corporate communications, healthcare, sustainability, and visual branding.  Michael W. Kempner is the company’s founder, president, and CEO.  The firm's corporate headquarters is in East Rutherford, New Jersey, the firm's operating headquarters is in New York, NY, with offices in Chicago, Los Angeles, San Francisco, Trenton, NJ, Washington, D.C., and London.

Berk Communications: Berk Communication and Marketing Group is an American public relations firm.  The company is best known for representing D'usse Cognac, Kevin Durant, Robinson Canó, CC Sabathia, Roc Nation Sports, Tao Group, Tidal and Alex Rodriguez.  Berk was founded in 1999.  Britney Spears hired Berk Communications in 2002 to promote Nyla, Spears' restaurant in Manhattan's Dylan Hotel.  In October 2015, MWW, a public relations firm headquartered in New York, acquired a majority stake in Berk.  The company operates as an independent subsidiary acquisition and has expanded across the United States and Europe.  Ron Berkowitz is the company's President and CEO.  In February 2016, Berk signed with The Statler Hotel & Residences as public relations support through the hotel's relaunch.  When baseball player Alex Rodriguez announced his retirement in 2016, it was also announced that Berk Communications would continue to work with Rodriguez.  Rodriguez first signed with Berk in 2013.

Tony Harrison (lobbyist): Tony Harrison is a communications consultant from Tasmania who has worked in journalism and public relations, marketing and government relations.  He is a former political journalist and former press secretary to two Tasmanian Premiers.  Tony Harrison was a former corporate affairs manager with the Australian Tourist Commission.  He is a former Executive Chairman of Tasmanian public relations, marketing and government relations consultancy, Corporate Communications and was a majority shareholder of the business.  Tony Harrison has been involved in providing high-level corporate advice and political lobbying services to clients in Tasmania and Australia, as well as overseeing community consultation programs for the corporate sector and for government.  He is the former National President of the Public Relations Institute of Australia (PRIA) and past President of the PRIA in Tasmania.  He has won awards for public relations and marketing including a PRIA National Golden Target Gold Award in 2000 and 2003 for government communication.  The consultancy has won a National Golden Target Gold award.  Tony Harrison was also awarded a special Tasmania Day Award for his service to the public relations profession.  Outside the business, Tony Harrison is a Director of Cricket Australia (the former ACB) and Chairman of Cricket Tasmania, and a member of the Council of the Australian Institute of Company Directors (AICD).

Public relations: Public relations (PR) is the practice of managing the spread of information between an individual or an organization (such as a business, government agency, or a nonprofit organization) and the public.  Public relations may include an organization or individual gaining exposure to their audiences using topics of public interest and news items that do not require direct payment.  This differentiates it from advertising as a form of marketing communications.  Public relations is the idea of creating coverage for clients for free, rather than marketing or advertising.  An example of good public relations would be generating an article featuring a client, rather than paying for the client to be advertised next to the article.  The aim of public relations is to inform the public, prospective customers, investors, partners, employees, and other stakeholders and ultimately persuade them to maintain a positive or favorable view about the organization, its leadership, products, or political decisions.  Public relations professionals typically work for PR and marketing firms, businesses and companies, government, and public officials as PIOs and nongovernmental organizations, and nonprofit organizations.  Jobs central to public relations include account coordinator, account executive, account supervisor, and media relations manager.  Public relation is an action of convincing people.  The PR person talks with others that make them think about the things the person wants them to think, and the people regard the person as their believes.  Public relations helps people to build up the connection to media and society that they can talk steadily.

Mark Bingham: Mark Kendall Bingham (May 22, 1970 – September 11, 2001) was an American public relations executive who founded his own company, the Bingham Group.  During the September 11 attacks in 2001, he was a passenger on board United Airlines Flight 93.  Bingham was among the passengers who, along with Todd Beamer, Tom Burnett and Jeremy Glick, formed the plan to retake the plane from the hijackers, and led the effort that resulted in the crash of the plane into a field near Shanksville, Pennsylvania, thwarting the hijackers plan to crash the plane into a building in Washington, D.C., most likely either the U.S. Capitol Building or the White House.

Supporting paragraphs: Mark Bingham United Airlines Flight 93
Answer: Bingham Group