Rajan Wilcox
The amount of fuel burned by a commercial airliner depends on a multitude of factors, including the aircraft's empty weight, payload, engine efficiency, flight path, and weather conditions. The type of aircraft and flight duration also play a significant role in fuel consumption. For example, a Boeing 747 burns around 10-11 tons of jet fuel per hour, while a shorter-haul Boeing 737-800 uses about 2.5-3 tons per hour. The Airbus A380, the largest passenger aircraft, consumes about 4,600 gallons of fuel per hour, while more modern aircraft like the Airbus A350 consume 38 pounds of fuel per nautical mile. Fuel efficiency in aircraft has improved over time, with jet airliners becoming 70% more fuel-efficient between 1967 and 2007 due to advancements in engine efficiency and airframes.
| Characteristics | Values |
|---|---|
| Fuel type | Jet A, Jet A-1, Aviation gasoline (AVGAS), Kerosene-based fuels, Jet fuel |
| Factors affecting fuel use | Aircraft type, Flight duration, Aircraft's empty weight, Carried payload, Efficiency of the engines, Flight path, Weather conditions, Sector length, Taxi time, Cargo weight, Jet stream direction |
| Fuel efficiency | 100 miles per gallon per person for a 747, 78 passenger-miles per US gallon for an Airbus A380, 17 passenger-miles per Imperial gallon for Concorde |
| Fuel consumption | 10-11 tons of fuel per hour for a Boeing 747-400, 2.5-3 tons of fuel per hour for a Boeing 737-800, 2.5 tons of fuel per hour for an Airbus A320, 7-8 tons of fuel per hour for a Boeing 777, 11-12 tons of fuel per hour for an Airbus A380, 38 lb of fuel per nautical mile for an Airbus A350, 1 gallon of fuel every second for a Boeing 747 |
| Fuel costs | Jet fuel prices have been increasing, Fuel accounts for 20-40% of an airline's expenditure, Fuel costs for carriers can be high due to rising prices |
| Fuel economy improvements | 70% increase in jet airliner fuel efficiency between 1967 and 2007, 45% decrease in average new aircraft fuel burn from 1968 to 2014, 20% more fuel efficiency per passenger kilometre for newer aircraft like the Boeing 787 Dreamliner, Airbus A350, and Bombardier CSeries |
| Fuel-saving strategies | Fuel hedging, Electric motors and ground-based power sources for ground movements, Airbus aircraft flying in formation 1.5-2 nmi behind another aircraft |
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What You'll Learn
- Fuel consumption depends on aircraft type, flight duration, and engine efficiency
- Jet fuel is kerosene-based, with a higher flash point than gasoline
- Fuel burn varies across the six flight stages
- Fuel efficiency has improved by 45% since 1968
- Fuel is a high cost for airlines, accounting for 20-40% of expenditure
Fuel consumption depends on aircraft type, flight duration, and engine efficiency
The fuel consumption of a commercial airliner depends on several factors, including aircraft type, flight duration, and engine efficiency.
Aircraft type plays a significant role in fuel consumption. Different aircraft have varying fuel consumption rates due to differences in size, weight, and engine type. For example, the Boeing 747-400 burns approximately 10-11 tons of fuel per hour, while the shorter-haul Boeing 737-800 consumes about 2.5-3 tons per hour. The Airbus A380, the largest passenger aircraft, burns around 4,600 gallons of fuel per hour, slightly more than the Boeing 747.
Flight duration is another critical factor. Longer flights will naturally require more fuel to complete the journey. A five-hour flight on a Boeing 747, for instance, would burn approximately 18,000 gallons of fuel. The duration of a flight is also influenced by factors such as flight path, weather conditions, and jet stream direction, all of which can impact fuel consumption.
Engine efficiency is a key determinant of fuel consumption. Jet airliners have become significantly more fuel-efficient over time due to improvements in engine technology. Modern twin-engine aircraft, such as the Airbus A350, are much more efficient than quadjets, consuming approximately 38 pounds of fuel per nautical mile. Additionally, propeller planes, like the Bombardier Dash 8 Q400 turboprop, are more fuel-efficient than jet aircraft for speeds below 460 miles per hour.
Other factors that influence fuel consumption include the aircraft's empty weight, payload weight, aerodynamics, and operational procedures. The number of passengers on board also affects fuel efficiency per person. For instance, a Boeing 747 with 500 passengers achieves 100 miles per gallon per person.
Overall, the fuel consumption of a commercial airliner is a complex interplay of various factors, with aircraft type, flight duration, and engine efficiency being key considerations.
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Jet fuel is kerosene-based, with a higher flash point than gasoline
Commercial airliners use a significant amount of fuel, and the type of fuel used is typically jet fuel, which is primarily kerosene-based. Kerosene-based jet fuels include Jet A and Jet A-1, which are colourless, easily combustible, and widely used in turbine engine airplanes. These fuels have a higher flash point than gasoline, which is an important safety feature.
The use of kerosene-based jet fuel dates back to the end of World War II, when both British and American standards for jet fuel were established. Over time, these standards evolved to balance performance and fuel availability, with adjustments made to specifications such as the minimum freezing point. Kerosene-based jet fuels are widely used due to their high energy density, which results in lower fuel consumption. This is particularly advantageous for large planes, as kerosene provides greater power and efficiency than gasoline.
The high energy density of kerosene-based jet fuel contributes to its higher flash point compared to gasoline. The flash point refers to the temperature at which the fuel ignites, and kerosene-based jet fuels typically have flash points above 38°C (100°F). This higher flash point makes jet fuel safer to transport and handle, reducing the risk of uncontrolled ignition.
The safety benefits of kerosene-based jet fuel with higher flash points are particularly important for aircraft carriers. For example, JP-5, a kerosene-based jet fuel with a high flash point of 60°C (140°F), is commonly used for aircraft stationed on aircraft carriers due to the increased fire risk in such environments. Additionally, Jet B, a naphtha-kerosene blend, is used in very cold climates for its enhanced cold-weather performance, despite being more dangerous to handle due to its lighter composition.
While jet fuel is primarily kerosene-based, it is important to note that there are blends that include both kerosene and gasoline. For instance, Jet B is a blend of approximately 30% kerosene and 70% gasoline, while JP-4, used in colder regions, is a blend of 65% gasoline and 35% kerosene. These blends are utilised to improve fuel performance in specific climatic conditions, balancing the need for higher flash points with the requirement for lower freezing points.
In summary, jet fuel being kerosene-based with a higher flash point than gasoline is a crucial aspect of commercial aviation. This choice of fuel type enhances safety, efficiency, and performance, contributing to the overall reliability of air travel.
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Fuel burn varies across the six flight stages
Fuel burn varies depending on the six stages of flight: taxi out, take-off, climb, cruise, approach, and taxi in. While several factors influence fuel consumption, shorter flights generally consume proportionately more fuel during the non-cruising stages.
During the taxi out stage, aircraft burn anywhere between 2% and 17% of their total fuel. This stage accounts for a higher proportion of total fuel burn on shorter flights. Some airlines and airports use tugs to move aircraft instead of burning kerosene while still on the ground.
Take-off is the most intense point of a flight in terms of fuel consumption. It is when the engines work the hardest, and the aircraft starts to accelerate along the runway. However, the percentage of fuel burned during take-off is relatively large on shorter flights compared to longer ones.
The climb stage involves the aircraft climbing to its designated altitude. The amount of fuel burned during this stage depends on selected power settings during the climb, atmospheric conditions, aircraft loadout, and winds aloft.
During the cruise stage, the aircraft flies at a designated altitude. This stage accounts for the majority of carbon emissions and contributes significantly to total fuel burn, especially on longer flights.
The approach stage involves the aircraft descending to the airport.
Finally, during the taxi in stage, the aircraft moves from the runway to the gate, burning more fuel while waiting to get to the gate.
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Fuel efficiency has improved by 45% since 1968
Commercial airliners use a wide range of fuel depending on the aircraft type, flight duration, and other factors. For instance, a Boeing 747-400 burns around 10-11 tons (approximately 22,000-24,000 pounds) of jet fuel per hour, while shorter flights using a Boeing 737-800 use about 2.5-3 tons (5,500-6,600 pounds) per hour. The Airbus A380, the largest passenger aircraft, consumes about 4,600 gallons of fuel each hour.
The amount of fuel burned by jet aircraft has been a significant area of focus, with sustainability and climate change concerns taking center stage. Fuel economy in aircraft is measured by transport energy efficiency, and there have been notable improvements over the years.
Between 1968 and 2014, the average fuel burn of new aircraft fell by approximately 45%, representing a compounded annual reduction of 1.3% with a variable reduction rate. This improvement is attributed to advancements in engine efficiency and airframes, with 40% of the gains coming from engines and 30% from airframes. Efficiency improvements were more pronounced in the early jet age, with a 55-67% gain from 1960 to 1980, and a slower improvement of 20-26% from 1980 to 2000.
The quest for greater fuel efficiency has led to the development of more aerodynamic shapes, winglets, and advanced computer systems for optimizing routes and aircraft loading. These improvements not only reduce fuel consumption but also augment the aircraft's range and lower their environmental impact. For example, the Airbus A321, featuring Sharklet wingtip devices, consumes 2.2 L/100 km (110 mpg) per person with a 200-seat layout.
Looking forward, NASA and aircraft manufacturers are optimistic about further significant fuel efficiency gains. By 2025, they project savings of up to 50%, and by 2030, they aim for a 60% improvement with new ultra-efficient configurations, including hybrid-electric architectures and improved propulsion systems.
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Fuel is a high cost for airlines, accounting for 20-40% of expenditure
Fuel is one of the highest costs for airlines, typically accounting for 20-40% of expenditure. This substantial cost is influenced by various factors, including the price of fuel and the region of operation. Fuel prices have been rising due to the war in Ukraine, and airlines have limited control over these market fluctuations.
The amount of fuel used by a commercial airliner depends on several factors, such as the type of aircraft, flight duration, aircraft weight, payload weight, engine efficiency, flight path, and weather conditions. For example, a Boeing 747-400 burns around 10-11 tons of jet fuel per hour, while a shorter-range Boeing 737-800 uses about 2.5-3 tons per hour. The Airbus A380, the largest passenger aircraft, consumes approximately 4,600 gallons of fuel per hour, or 1.3 gallons per second.
To optimise fuel efficiency, airlines consider several strategies. These include improving aerodynamics, reducing weight, enhancing engine efficiency, and optimising airspeed and altitude. Additionally, taxiing on the ground can contribute significantly to fuel burn, so some airlines use tugs or electric motors to move aircraft instead of running the jet engines.
Fuel hedging is another strategy employed by airlines to manage fuel costs. By purchasing fuel in advance or securing favourable contracts, airlines can protect themselves from sudden price spikes. However, this strategy can also result in losses if fuel prices drop unexpectedly.
With sustainability and climate change becoming increasingly important, airlines are also exploring ways to reduce their fuel consumption and associated emissions. For example, Airbus has tested flying aircraft in formation, similar to migrating birds, which could save up to 10% of fuel.
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Frequently asked questions
The amount of fuel used by a commercial airliner depends on several factors, including the aircraft type, flight duration, aircraft weight, payload, engine efficiency, flight path, and weather conditions. For example, a Boeing 747-400 burns around 10-11 tons of jet fuel per hour, while a shorter-haul Boeing 737-800 uses about 2.5-3 tons per hour.
The fuel efficiency of an aircraft can be improved by optimising aerodynamics, reducing weight, and improving engine brake-specific fuel consumption and propulsive efficiency. Additionally, flying at an optimum altitude and airspeed can maximise endurance and range.
The weight of the aircraft, including the airframe and fuel, contributes to fuel consumption. By using lightweight materials such as titanium, carbon fibre, and composite plastics, aircraft manufacturers can reduce weight and improve fuel efficiency.
While take-off requires the engines to work hard and burn a significant amount of fuel, it is not the most fuel-intensive part of a flight. On longer flights, cruising consumes the majority of fuel, while on shorter flights, taxiing, take-off, and climb can contribute more significantly to overall fuel usage.
Airlines employ various strategies to manage fuel costs and consumption, including fuel hedging to mitigate price fluctuations, optimising flight routes, and utilising fuel-efficient aircraft designs. Additionally, some airlines use tugs or electric motors for ground movements to reduce fuel burn during taxiing.
