Flight length. In aviation, the flight length or flight distance refers to the distance of a flight. Aircraft do not necessarily follow the great-circle distance, but may opt for a longer route due to weather, traffic, to utilise a jet stream, or to refuel.

Commercial flights are often categorized into long-, medium- or short-haul by commercial airlines based on flight length, although there is no international standard definition.

The related term flight time is defined by ICAO (International Civil Aviation Organization) as "The total time from the moment an aeroplane first moves for the purpose of taking off until the moment it finally comes to rest at the end of the flight", and is referred to colloquially as "blocks to blocks" or "chocks to chocks" time. In commercial aviation, this means the time from pushing back at the departure gate to arriving at the destination gate. Flight time is measured in hours and minutes as it is independent of geographic distance travelled. Flight time can be affected by many things such as wind, traffic, taxiing time, and aircraft used.

Short-haul and long-haul

A flight's length can also be described using the aviation term of "Flight Haul Type", such as "short-haul" or "long-haul". Flight haul types can be defined using either flight distance or flight time.

Time-based definitions

Distance-based definitions

David W. Wragg classifies air services as medium-haul being between ; short-haul as being shorter and long-haul as being longer.
David Crocker defines short-haul flights as shorter than , and long-haul as the opposite.

Asia & Australia 
 Hong Kong International Airport considers destinations in the Americas, Europe, the Middle East, Africa, Southwest Pacific and the Indian Subcontinent long-haul and all others are short-haul.
 Japan Air Lines defines routes to Europe and North America as long-haul and all other flights as short-haul.
 Qatar Airways  defines all flights from Qatar to the Americas, Australia, and New Zealand as Ultra-long-haul, and all other flights as medium or long-haul.
 Virgin Australia defines domestic flights as within Australia, short-haul as those to South East Asia/Pacific and long-haul as those to Abu Dhabi or Los Angeles.

Europe 
 The European Union defines any passenger flight between city pairs separated by a great circle distance between  to be medium-haul, below as short-haul, and above as long-haul routes.
 Eurocontrol defines "very short-haul" flights as being less than , short-haul flights being between 500 and 1,500 km, medium-haul flights being between , and long-haul flights as longer than that.
 The Association of European Airlines defined Long-haul as flights to Americas, sub-Saharan Africa, Asia, Australasia and medium-haul as flights to North Africa and Middle East. 
 The now defunct airline Air Berlin defined short- and medium-haul as flights to Europe/North Africa and long-haul as those to the rest of the world.
 Air France defines short-haul as domestic, medium-haul as within Europe/North Africa and long haul as the rest of the world.

North America 
 American Airlines defines short-/medium-haul flights as being less than  and long-haul as either being more than 3000 miles or being the New York–Los Angeles and New York–San Francisco routes.
 United Airlines defines short-haul flights as being less than  and long-haul flights as being greater than .

Aircraft-based definitions 
Flight Haul Type terms are sometimes used when referring to commercial aircraft.  Some commercial carriers choose to refer to their aircraft using flight haul type terms, for example:
 Delta Air Lines referred to its Boeing 717, MD-88 and MD-90 as short-haul domestic aircraft; Boeing 757, Boeing 737, Airbus A319 and A321 as long-haul domestic; and its transoceanic Boeing 757, 767, 777 and Airbus A330 as long-haul.
 Lufthansa classifies its fleet as: long-haul for wide-body aircraft such as the Airbus A330/Airbus A340, Airbus A350, Airbus A380, Boeing 747, and Boeing 787 Dreamliner; medium-haul for narrow-body aircraft like the Airbus A320 and 737 families; and short-haul for regional jets like the Embraer E-Jets and the Bombardier CRJ-900.
 TUI Airways refers to their Boeing 737 as a short and mid-haul airliner and the Boeing 767 and 787 as long haul.

While they are capable of flying further, long-haul capable wide-bodies are often used on shorter trips.  In 2017 - 40% of A350 routes were shorter than , 50% of A380 flights fell within , 70% of 777-200ER routes were shorter than , 80% of 787-9s routes were shorter than , 70% of 777-200LRs flights were shorter than .

Superlative flights

Shortest commercial flight
The Westray to Papa Westray flight in Orkney, operated by Loganair, is the shortest commercial flight in the world, covering 2.8 km (1.7 mi) in two minutes scheduled flight time including taxiing.

Longest commercial flight 

The world's longest ever commercial flight was Air Tahiti Nui Flight TN64 in early 2020. Due to the COVID-19 pandemic and the impossibility of transit in the United States through Los Angeles International Airport, Air Tahiti Nui scheduled and operated in March and April 2020 Flight TN64 as a non-stop flight between Papeete and Paris-Charles de Gaulle, using a Boeing 787-9 and covering 15,715 km (9,765 mi; 8,485 nmi). in a scheduled time of 16 hours and 20 minutes.  it continues to hold the record for the longest ever scheduled commercial nonstop flight (by great circle distance) as well as the world's longest domestic flight.

 Singapore Airlines Flights 23 and 24 is the world's longest active commercial flight between Singapore and New York–JFK, covering  in around 18 hours and 40 minutes, operated by an Airbus A350-900ULR.

Distinctions

Great-circle distance versus flight length

The shortest distance between two geographical points is the great-circle distance. In the example (right), the aircraft travelling westward from North America to Japan is following a great-circle route extending northward towards the Arctic region. The apparent curve of the route is a result of distortion when plotted onto a conventional map projection and makes the route appear to be longer than it really is.  Stretching a string between  North America and Japan on a globe will demonstrate why this really is the shortest route despite appearances.

The actual flight length is the length of the track flown across the ground in practice, which is usually longer than the ideal great-circle and is influenced by a number of factors such as the need to avoid bad weather, wind direction and speed, fuel economy, navigational restrictions and other requirements. In the example, easterly flights from Japan to North America are shown taking a longer, more southerly, route than the shorter great-circle; this is to take advantage of the favourable jet stream, a fast high-altitude tail-wind that assists the aircraft along its ground track saving more time or fuel than the geographically shortest route.

Flight distance versus flight duration 
Even for flights with the same origin and destination, a flight's duration can be affected by  routing, wind, traffic, taxiing time, or aircraft used.

For example, on the Luxembourg to Bucharest route operated by Luxair, the scheduled flight length remains constant while the flight duration varies depending on aircraft used. On Thursday mornings, Luxair operates a DHC-8 turboprop with a scheduled duration of approximately 3 hours, while on Saturday mornings, Luxair's use of an Embraer 190 jet reduces the scheduled duration of the flight down to approximately 2 hours 20 minutes.

See also
 Endurance (aeronautics)
 Flight distance record
 Fuel economy in aircraft
 International flight
 List of regional airliners
 Longest flights
 Non-stop flight
 Range (aeronautics)
 Short-haul flight ban
 Ultra long haul flight

References

External links 
 The Great Circle Mapper Displays Great Circle flight routes on a Map And calculates distance and duration
 Flight-time and -distance calculator
 Air Miles Calculator
 Flight Duration Calculator
 Flight Distance Calculator Flight routes duration and Great Circle Mapper

Civil aviation