Question: Where is the airline withe the frequent flyer program called Qualiflyer headquartered?

Context paragraphs:
Randy Petersen: Randy Petersen is the editor and publisher of "InsideFlyer" magazine, the founder of FlyerTalk, an online travel bulletin board and the idea man behind "BoardingArea", "milepoint" and several other frequent flyer/business travel web sites.  Petersen is frequently called upon by news media for opinions about the frequent flyer and travel industry and is often referred to by "The Wall Street Journal" and "Condé Nast Traveler" as the "frequent flyer guru".  He has been following frequent flyer programs since their inception in the early 1980s and currently heads the Frequent Flyer Network, a conglomeration of travel-related web sites.

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.

Austrian Airlines: Austrian Airlines AG, sometimes shortened to Austrian, is the flag carrier of Austria and a subsidiary of the Lufthansa Group.  The airline is headquartered in the grounds of Vienna International Airport in Schwechat where it also maintains its hub.  It flies to 6 domestic and more than 120 international year-round and seasonal destinations in 55 countries as of July 2016.  and is a member of the Star Alliance.

MileagePlus: MileagePlus is the loyalty program of United Airlines and Aeromar that offers rewards to passengers traveling on certain types of tickets.  Following the 2011 merger agreement between United Airlines and Continental Airlines, United Mileage Plus was chosen to be the frequent flyer program for the combined airline.  The program was subsequently renamed to MileagePlus, and maintains its relationship with its Star Alliance partners, as well as other airline and travel enterprise agreements.

Virgin America: Virgin America Inc. is an American airline that was founded in 2004 and began operations in 2007.  Headquartered in Burlingame, California in the San Francisco Bay Area, with San Francisco International Airport as its main hub, Virgin America is a brand that was created by the British Virgin Group as an American counterpart to the corporation's other airlines.  The airline flies between major metropolitan cities on the Eastern and West Coast seaboards.  Virgin America's frequent flyer program Elevate provides award flights and other benefits to frequent fliers.

Qualiflyer: Qualiflyer was a frequent flyer program, created in April 1992 by Austrian Airlines, Crossair and Swissair.  When Swissair began acquiring stakes in other European airlines in 1998, Qualiflyer was extended to become their frequent flyer programs as well.  This spawned the alliance known as The Qualiflyer Group.  With the failure of Swissair in 2002, the group dissolved along with the program and a company was formed to give each former member airline an individual frequent-flyer program.

Continent pass: A continent pass (usually called something like Europe (air)pass, Pacific (air)pass or American (air)pass) is a product and service of an airline alliance.  For a relatively low price the traveler can travel freely using all intra-continental flights the airline alliance offers on that continent.  There are restrictions on the number of miles, flights or stops the traveler can make.  Travelers can benefit from the extensive networks airline alliances offer and can earn reward points for each mile they fly by participating in the alliance's frequent flyer program.

Magsformiles: MagsforMiles, a program run by CAP Systems, allows people to redeem frequent flyer miles for magazine subscriptions.  Members of frequent flyer programs with an active, positive mileage balance may receive direct mail informing them of the opportunity to redeem their miles for magazines.  Opportunities to redeem miles for magazines are also available on Airline websites.

Color Air: Color Air AS was the first Norwegian low-cost airline.  It operated from Oslo Airport, Gardermoen in 1998 and 1999 with a fleet of three Boeing 737-300 aircraft.  Color Air was a brand extension of Color Line, which shared a common owner in the Olav Nils Sunde-controlled Color Group.  The airline operated five daily round trips from Oslo to Trondheim and Bergen, four to Ålesund and one to London, in addition to a weekly trip to Alicante.  Color Air pioneered the low-cost business model in Norway, with a denser seating, no frills and lack of a frequent flyer program.  Tickets were sold only via the Internet, by telephone or in supermarkets; when bought from travel agents, there was a 200 kr surcharge.

Club Premier (loyalty program): Club Premier is a loyalty program based in Mexico, originally the frequent flyer program of Aeroméxico, the Mexican airline, now spun off and operated by PLM, which is 51% owned by Aeroméxico and 49% by AIMIA, the Montreal-based loyalty company with its origins as the frequent flyer program of Air Canada.

Supporting paragraphs: Qualiflyer Austrian Airlines
Answer: Vienna International Airport in Schwechat