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In the aviation industry, a flight number or flight designator is a code for an airline service consisting of two-character airline designator and a 1 to 4 digit number. [1] For example, QF9 is a Qantas Airways service from Perth, Australia to London Heathrow. A service is called "direct" if it is covered by a single flight number, regardless of the number of stops or equipment changes. For example, QF1 flies from Sydney to Singapore to London on Qantas Airways. A given flight segment may have multiple flight numbers on different airlines under a code-sharing agreement. Strictly speaking, the flight number is just the numerical part, but it is commonly used for the entire flight designator.
The flight designator of the operating carrier of a commercial flight is used as a call sign. [2] This is distinct from the aircraft's registration number, which identifies a specific airplane.
A number of conventions have been developed for defining flight numbers, although these vary widely from airline to airline, and are increasingly being modified. [3] Eastbound and northbound flights are traditionally assigned even numbers, while westbound and southbound flights have odd numbers. Other airlines will use an odd number for an outbound flight and use the next even number for the reverse inbound flight. For destinations served by multiple flights per day, numbers tend to increase during the day. Hence, a flight from point A to point B might be flight 401 and the return flight from B to A would be 402, while the next pair of flights on the same route would usually be assigned codes 403 and 404.
Flight numbers of less than three digits are often assigned to long-haul or otherwise premium flights. For example, flight number 1 is often used for an airline's "flagship" service (see below for a 'List of flight number 1 by airlines'). However, for airlines in Mainland China, one-digit and two-digit numbers are only reserved for administrative charters. Furthermore, Cathay Pacific assigns flight numbers which are less than 100 for cargo flights.
Four-digit numbers in the range 3000 to 5999 typically represent regional affiliate flights, while numbers larger than 6000 are generally codeshare numbers for flights operated by different airlines or even railways.
Likewise, flight numbers larger than 9000 usually refer to ferry flights; these carry no passengers and are used to relocate aircraft to or from a maintenance base, or from one air travel market to another in order to start new commercial flights. Flight numbers starting with 8 are often used for charter flights, but it always depends on the commercial carrier's choice.
In a codeshare, airlines share their aircraft with others, resulting in the flight having more than one flight number on the same sector, and either the same or different flight numbers on joined sectors.
As an example, QF8412 flies from Dubai to Sydney, but it is codeshared with and operated as EK412. Another example is QF3920, which is a flight from Lima, Peru to Santiago, Chile that is also codeshared with LATAM 523.
Most flights are non-stop from A to B, and few are from A to B then to C (both A-B and B-C have flight number 1). Aircraft type may change due to operation need or unforseen circumstance.
A notable former flight number 1 was British Airways flight BA1, operated by the Concorde between London Heathrow and New York's John F. Kennedy airport. After the retirement of Concorde in 2003 the flight number was retired with it, however in 2009 it was given to the all business class A318 flight between London City Airport and New York JFK via Shannon in Ireland. This route ceased operation in 2020 due to the COVID-19 pandemic, and British Airways has since announced it will not be restarting the service.
Flight numbers are often taken out of use after a crash or a serious incident. Examples include:
Other considerations may lead an airline not to change a flight number; there are at least four instances of the same flight numbers that have suffered two serious accidents:
Airline mega mergers, in markets such as the United States, have made it necessary to break conventional flight numbering schemes. Organizations such as IATA, ICAO, ARC, as well as CRS systems and the FAA's ATC systems limit flight numbers to four digits (0001 to 9999). The pool of available flight numbers has been outstripped by demand for them by emergent mega-carriers. As such, some carriers use the same flight number for back-and-forth flights (e.g., DCA-PBI-DCA), or in other cases carriers have assigned a single flight number to a multi-leg flight (e.g., ICT-DAL-HOU-MDW-OMA-DEN-ABQ-LAS-BDL). [85]
Although 'flight number' is the term used colloquially, the official term as defined in the Standard Schedules Information Manual (SSIM) published annually by the International Air Transport Association (IATA) Schedules Information Standards Committee (SISC), is flight designator. Officially the term 'flight number' refers to the numeric part (up to four digits) of a flight code. For example, in the flight codes QF103 and AF296Q, "103" and "296" are flight numbers. Even within the airline and airport industry, it is common to use the colloquial term rather than the official term.
Flight numbers are also sometimes used for spacecraft, though a flight number for an expendable rocket (say, Ariane 5 Flight 501) might more reasonably be called the serial number of the vehicle used, since an expendable rocket can only be launched once. Space Shuttle missions used numbers with the STS prefix, for example, STS-93. SpaceX uses sequential numbers for flights of reused boosters. As an example, Crew-2 used booster B1061.2 (the second flight of booster B1061).
Qantas Airways Limited, or simply Qantas, is the flag carrier of Australia, and is the largest airline by fleet size, international flights, and international destinations in Australia and Oceania. A founding member of the Oneworld airline alliance, it is considered to be the only airline in the world that flies to all seven continents, with it operating flights to Africa, Antarctica, Asia, Europe, North America and South America from its hubs in Sydney, Perth, Melbourne and Brisbane. It also flies to over 60 domestic destinations across Australia.
EL AL Israel Airlines Ltd., trading as EL AL, is an Israeli airline and the nation's flag carrier. Since its inaugural flight from Geneva to Tel Aviv in September 1948, the airline has grown to serve almost 50 destinations, operating scheduled domestic and international services and cargo flights within Israel, and to Europe, the Middle East, the Americas, Africa, and the Far East, from its main base in Ben Gurion Airport.
Air New Zealand Limited is the flag carrier of New Zealand. Based in Auckland, the airline operates scheduled passenger flights to 20 domestic and 30 international destinations in 18 countries, primarily within the Pacific Rim. The airline has been a member of the Star Alliance since 1999.
Finnair Oyj is the flag carrier and largest full-service legacy airline of Finland, with headquarters in Vantaa on the grounds of Helsinki Airport, its hub. Finnair and its subsidiaries dominate both domestic and international air travel in Finland. Its major shareholder is the government of Finland, which owns 55.9% of its shares. Finnair is a member of the Oneworld airline alliance.
All Nippon Airways Co., Ltd. is a Japanese airline headquartered in Minato, Tokyo. ANA operates services to both domestic and international destinations and is Japan's largest airline, ahead of its main rival flag carrier Japan Airlines. As of April 2023, the airline has approximately 12,800 employees. The airline joined as a Star Alliance member in October 1999.
Asiana Airlines Inc. is a South Korean airline headquartered in Seoul. In 2019, it accounted for 25% of South Korea's international aviation market and 20% of its domestic market. It maintains its international hub at Incheon International Airport and its domestic hub at Gimpo International Airport, both in Seoul. It is a full-service airline and a member of Star Alliance.
The Boeing 747-400 is a large, long-range wide-body airliner produced by Boeing Commercial Airplanes, an advanced variant of the initial Boeing 747. The "Advanced Series 300" was announced at the September 1984 Farnborough Airshow, targeting a 10% cost reduction with more efficient engines and 1,000 nautical miles [nmi] of additional range. Northwest Airlines became the first customer with an order for 10 aircraft on October 22, 1985. The first 747-400 was rolled out on January 26, 1988, and made its maiden flight on April 29, 1988. Type certification was received on January 9, 1989, and it entered service with NWA on February 9, 1989.
Bangkok Airways plc is a regional airline based in Bangkok, Thailand. It operates scheduled services to destinations in Thailand, Cambodia, Hong Kong, Laos, Maldives, Myanmar, Singapore, and Vietnam. Its main base is Suvarnabhumi Airport.
Jetstar Airways Pty Ltd, operating as Jetstar is an Australian low-cost airline headquartered in Melbourne, Victoria. It is a wholly owned subsidiary of Qantas, created in response to the threat posed by the airline Virgin Blue. Jetstar is part of Qantas' two brand strategy of having Qantas Airways for the premium full-service market and Jetstar for the low-cost market. As of June 2015, Jetstar was carrying 8.5% of all passengers travelling in and out of Australia.
JSC Uzbekistan Airways, operating as Uzbekistan Airways, is the flag carrier of Uzbekistan, headquartered in Tashkent. From its hub at Islam Karimov Tashkent International Airport, the airline serves a number of domestic destinations; the company also flies international services to Asia, Europe and North America.
Air Astana is an airline and the flag carrier of Kazakhstan. Based in Almaty, the airline was founded by the Government of Kazakhstan’s sovereign wealth fund Samruk Kazyna (51%) and BAE Systems (49%) and commenced operations on 15 May 2002. In February 2024 it became a dual listed company, being listed on the Kazakhstan and London stock exchanges. It is the largest airline in Central Asia and the Caucasus region with 69% and 40% of market share on domestic and intra-regional routes from Kazakhstan.
Winair is a government-owned Dutch regional airline based in Sint Maarten. Founded in 1961 by Georges Greaux and Hippolyte Ledee, It has a fleet of six aircraft serving twelve destinations, mostly within the Leeward Islands group of the Lesser Antilles in the North East Caribbean. It has its headquarters on the grounds of Princess Juliana International Airport. Since 1 March 2023, it has been a part of the Flying Blue frequent flyer programme.
Myanmar Airways International Co., Ltd. is a privately owned airline headquartered in Yangon, Myanmar. It operates scheduled international services to destinations mainly in Southeast Asia and is based at Yangon International Airport. Myanmar Airways International was the sponsor of the 2013 Southeast Asian Games. MAI's logo shows pyinsarupa, a traditional Burmese chimeric animal.
TUI fly Netherlands, legally incorporated as TUI Airlines Netherlands, is a Dutch charter airline headquartered in Schiphol-Rijk on the grounds of Amsterdam Airport Schiphol in Haarlemmermeer, Netherlands. It is the charter carrier of the Dutch arm of the German travel conglomerate TUI Group and its main base is Schiphol Airport.
Southern Cross Route is a term for passenger flights from Australasia to Europe via the Western Hemisphere. The term was coined by British Commonwealth Pacific Airlines when they began services from Sydney to Vancouver in 1949. The route was extended to Europe following the signing of an air services agreement between Australia and the United Kingdom in 1957, which saw Qantas flying from Sydney to London via Los Angeles and New York using Lockheed L-1049 Super Constellations. The name is in honor of Sir Charles Kingsford Smith's historic 1928 flight in the aircraft Southern Cross. The equivalent route running through the Eastern Hemisphere is known as the Kangaroo Route.
Juneyao Air is an airline headquartered in Changning, Shanghai, China.
Air Busan Co., Ltd., operating as Air Busan is a low-cost airline based in Busanjin-gu, Busan, South Korea. It is a subsidiary of Asiana Airlines. The airline began its operation in 2007 as Busan International Airlines Company ; it launched service in October 2008.
Multi-Aero, Inc., doing business as Air Choice One, a division of Southern Airways Corporation, was an American commuter airline with its headquarters in Concord, Missouri, within the Greater St. Louis area. It operated as a regional airline offering commuter flights from St. Louis Lambert International Airport to smaller regional airports, subsidized under the Essential Air Service program. Air Choice One's callsign, "Weber," is in honor of Mike Weber, the airline's first Chief Pilot.
Jetstar Japan Co., Ltd. is a Japanese low-cost airline headquartered in Narita, Chiba. The airline serves destinations across the Asia-Pacific region, using a fleet of Airbus A320 aircraft. It is a joint venture between Qantas, Japan Airlines and Tokyo Century Corporation, who own 33.3%, 50% and 16.7% stakes respectively.
Over time, commercial airlines have established a number of scheduled ultra long-haul non-stop flights. These exceptionally long routes reduce the travel time between distant city pairs as well as the number of stops needed for passengers' travels, thereby increasing passenger convenience. For an airline, choosing to operate long flights can also build brand image as well as loyalty among a set of flyers. Therefore, competition among airlines to establish the longest flight occurs.