Question: In commercial aviation, what is the system where in-flight food or beverages are able to be purchases after being issue the document or electronic record by the airline?
Context: FooDB (The Food Database) is a freely available, open-access database containing chemical (micronutrient and macronutrient) composition data on common, unprocessed foods.  It also contains extensive data on flavour and aroma constituents, food additives as well as positive and negative health effects associated with food constituents.  The database contains information on more than 28,000 chemicals found in more than 1000 raw or unprocessed food products.  The data in FooDB was collected from many sources including textbooks, scientific journals, on-line food composition or nutrient databases, flavour and aroma databases and various on-line metabolomic databases.  This literature-derived information has been combined with experimentally derived data measured on thousands of compounds from more than 40 very common food products through the Alberta Food Metabolome Project which is led by Dr. David Wishart of the University of Alberta.  Users are able to browse through the FooDB data by food source, name, descriptors or function.  Chemical structures and molecular weights for compounds in FooDB may be searched via a specialized chemical structure search utility.  Users are able to view the content of FooDB using two different “Viewing” options: FoodView, which lists foods by their chemical compounds, or ChemView, which lists chemicals by their food sources.  Knowledge about the precise chemical composition of foods can be used to guide public health policies, assist food companies with improved food labelling, help dieticians prepare better dietary plans, support nutraceutical companies with their submissions of health claims and guide consumer choices with regard to food purchases. The freedoms of the air are a set of commercial aviation rights granting a country's airlines the privilege to enter and land in another country's airspace, formulated as a result of disagreements over the extent of aviation liberalisation in the Convention on International Civil Aviation of 1944, known as the Chicago Convention.  The United States had called for a standardized set of separate air rights to be negotiated between states, but most other countries were concerned that the size of the U.S. airlines would dominate air travel if there were not strict rules.  The freedoms of the air are the fundamental building blocks of the international commercial aviation route network.  The use of the terms "freedom" and "right" confer entitlement to operate international air services only within the scope of the multilateral and bilateral treaties (air services agreements) that allow them. In commercial aviation, buy on board (BoB) is a system where in-flight food or beverages are not included in the ticket price, but are either purchased on board, or ordered in advance as an optional extra during or after booking process. An airline ticket is a document or electronic record, issued by an airline or a travel agency, that confirms that an individual is entitled to a seat on a flight on an aircraft.  The airline ticket may be one of two types: a "paper ticket", which comprises coupons or vouchers; and an electronic ticket (commonly referred to as an "e-ticket"). Valuair (Chinese: 惠旅航空) was a Singapore-based low-cost carrier.  It was launched in 2004, offering initial services to Bangkok and Hong Kong.  It differentiates itself from other low-cost carriers in that it offers frills such as a baggage allowance of over 20 kg, in-flight food, allocated seats, and 32 inch seat pitch.  Acquired in 2005 by Jetstar Asia Airways, the Valuair brand was retained for Jetstar Asia's scheduled services to major cities in Indonesia until October 2014. Gogo Inc. is a provider of in-flight broadband Internet service and other connectivity services for commercial and business aircraft, headquartered in Chicago, Illinois.  17 airlines partner with Gogo to provide in-flight WiFi, including British Airways, Aer Lingus, Iberia, Gol linhas aereas, Beijing Capital, Aeromexico, American Airlines, Air Canada, Alaska Airlines, Delta Air Lines, Japan Airlines, JTA, United Airlines, Hainan Airlines, Virgin America, Vietnam Airlines and Virgin Atlantic.  Gogo Inc. is a holding company, operating through its two subsidiaries, Gogo LLC and Aircell Business Aviation Services LLC (now Gogo Business Aviation Inc.).  According to Gogo, over 2,500 commercial aircraft and 6,600 business aircraft have been equipped with its onboard Wi-Fi services.  The company is also the developer of 2Ku, the new in-flight (satellite solution) Wi-Fi technology. LSG Sky Chefs is the brand name of LSG Lufthansa Service Holding AG, which is the world's largest provider of airline catering (although Gate Gourmet claims the title of world's largest "independent" provider) and in-flight services.  It is a subsidiary of Deutsche Lufthansa AG.  A part of the company was formerly owned by AMR Corporation, parent company of American Airlines.  Its primary business function is to prepare and deliver meals, beverages and snacks to aircraft for domestic and international flights.  In addition the company also provides extended services on all other aspects of in-flight service, including the design and sourcing of in-flight equipment, in-flight logistics, in-flight management, onboard retail management and the management of airport lounges to name but a few. Douglas Hofsass (Doug Hofsass) is a former Assistant Administrator in the United States Department of Homeland Security, assigned to the Transportation Security Administration.  In addition to his role as the Assistant Administrator overseeing risk based security and trusted traveler programs, he also served as the Federal Security Director in New York City.  As part of his responsibilities in New York City, he oversaw the first implementation of federal security operations under DHS at the Downtown Manhattan Heliport and the East 34th Street Heliport for commercial helicopter flights to John F Kennedy International Airport, Newark Liberty International Airport and LaGuardia Airport.  Hofsass also held the posts of General Manager of Commercial Aviation and Deputy Assistant Administrator for Policy and Industry Engagement for the Transportation Security Administration.  He was heavily involved in launching the TSA Pre-Check Program, and claimed a collaborative partnership with the US Customs Department and their Global Entry Program.  Hofsass served at the Transportation Security Administration from 2002 until 2013, including several years working directly for Administrators John S. Pistole, Kip Hawley and Gale Rossides.  Prior to his Federal executive service, Hofsass was with United Airlines management for nearly 10 years.  Hofsass returned to the commercial aviation sector in 2013. Antony Habersack Jannus, more familiarly known as Tony Jannus (July 22, 1889 – October 12, 1916), was an early American pilot whose aerial exploits were widely publicized in aviation's pre-World War I period.  He flew the first airplane from which a parachute jump was made, in 1912.  Jannus was also the first airline pilot, having pioneered the inaugural flight of the St. Petersburg–Tampa Airboat Line on January 1, 1914, the first scheduled commercial airline flight in the world using heavier-than-air aircraft.  The "Tony Jannus Award", created to perpetuate his legacy, recognizes outstanding individual achievement in the scheduled commercial aviation industry and is conferred annually by the Tony Jannus Distinguished Aviation Society founded in Tampa, Florida, in 1963. The Tony Jannus Award recognizes outstanding individual achievement in scheduled commercial aviation by airline executives, inventors and manufacturers, and government leaders.  The award is conferred annually by the Tony Jannus Distinguished Aviation Society and was first bestowed in 1964 in Tampa, Florida, U.S. Its namesake, aviation pioneer Tony Jannus (1889–October 12, 1916), piloted the inaugural flight of the St. Petersburg–Tampa Airboat Line on January 1, 1914, the first scheduled commercial airline flight in the world using heavier-than-air aircraft.  In addition to preserving the legacy of Tony Jannus, the non-profit Society also offers financial assistance to college students pursuing studies in aviation and conducts an annual essay contest for high school students to encourage careers in aviation.
Answer: In commercial aviation, buy on board (BoB) is a system where in-flight food or beverages are not included in the ticket price, but are either purchased on board