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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, "BA 222" is a British Airways service from Nashville, Tennessee 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, "WN 417" flies from Jacksonville to Baltimore to Oakland to Los Angeles on Southwest Airlines. 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 101 and the return flight from B to A would be 102, while the next pair of flights on the same route would usually be assigned codes 103 and 104.
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 a hypothetical example, flight QQ1234 may fly from airport AAA to BBB to CCC. The AAA-BBB segment may be serviced by airline QQ, and the BBB-CCC segment by airline RR, on a different aircraft. The same flight may also be sold as RR3210, and by a third airline SS as SS2345. Also, the individual flight legs may have multiple flight numbers: AAA-BBB may be QQ12, RR23, and SS45.
For example, Alaska Airlines flight AS61 as of June 2018 [update] flies from Juneau (JNU) to Yakutat (YAK) to Cordova (CDV) to Anchorage (ANC). A ticket for the Yakutat to Anchorage segment is specified as AS61 YAK-ANC. It is even possible for a given flight number to cover a sequence beginning and ending at the same airport.
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.
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 BA2490 and BA2491A, "2490" and "2491" 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).
Incheon International Airport is the main international airport serving Seoul, the capital of South Korea. It is also one of the largest and busiest airports in the world.
Kalitta Air is an American cargo airline headquartered at Willow Run Airport, Ypsilanti Township, Michigan. The company operates international scheduled and cargo charter services. Its call sign "Connie" is from its founder, Connie Kalitta.
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.
Ontario International Airport is an international airport two miles east of downtown Ontario, in San Bernardino County, California, United States, about 38 mi (61 km) east of downtown Los Angeles and 18 mi (29 km) west of downtown San Bernardino. It is owned and operated under a joint-powers agreement with the city of Ontario and San Bernardino County.
Naples Airport, formerly known as Naples Municipal Airport, is a public use airport located two nautical miles (4 km) northeast of the central business district of Naples, the most populous city and county seat of Collier County, Florida. It is owned by the Naples Airport Authority. The airport is home to flight schools, air charter operators, car rental agencies, and corporate aviation and non-aviation businesses. The airport is also a central location for public services, including fire/rescue services, mosquito control, the Collier County Sheriff's Aviation Unit and other community services.
Fairbanks International Airport is a state-owned public-use airport located three miles (5 km) southwest of the central business district of Fairbanks, a city in the Fairbanks North Star Borough of the United States state of Alaska. It is located in the South Van Horn census-designated place. Fairbanks was the smallest city in the United States with regularly scheduled non-stop international flights, as Condor offered weekly flights to Frankfurt during the summer tourist season. Air North is now the only international airline to offer scheduled charters with flights.
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 in Seoul and Gimhae International Airport in Busan, and its domestic hub at Gimpo International Airport in Seoul. It is a full-service airline and a member of Star Alliance.
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Air Astana is an airline group and the flag carrier of Kazakhstan. Based in Almaty, Kazakhstan, the airline, previously jointly owned by the Government of Kazakhstan’s sovereign wealth fund Samruk Kazyna (51%) and BAE Systems PLC (49%), has since February 2024 been publicly listed on the London, Astana, and Almaty 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.
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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.
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.