Regan Brown
The amount of fuel used by commercial airliners is a topic of great interest, especially with rising fuel prices and growing concerns about sustainability and climate change. Several factors influence the fuel consumption of an aircraft, including the type and size of the aircraft, flight duration, aircraft weight, payload, engine efficiency, flight path, and weather conditions. While take-off is often considered the most fuel-intensive stage of a flight, cruising can account for a significant portion of total fuel burn, especially on longer flights. Additionally, shorter flights burn more fuel proportionally during taxiing and other non-cruising stages.
| Characteristics | Values |
|---|---|
| Fuel economy | Varies based on aircraft type, flight duration, aircraft's empty weight, carried payload, efficiency of the engines, flight path, and weather conditions |
| Fuel efficiency | Increased with better aerodynamics, reduced weight, improved engine brake-specific fuel consumption, and propulsive efficiency or thrust-specific fuel consumption |
| Average fuel burn | 28 g of fuel per kilometre or 3.5 L/100 km (67 mpg-US) fuel consumption per passenger |
| Fuel burn per kilometre | A321neo: 2.7 litres of fuel per kilometre |
| Fuel burn per hour | Boeing 747-400: 10-11 tons; Boeing 737-800: 2.5-3 tons; Airbus A320: 2.5 tons; Boeing 777: 7-8 tons; Airbus A380: 11-12 tons |
| Fuel burn for a specific distance | Transatlantic flight from New York to London (3,451 nautical miles): 36,000 gallons (136,275 litres) for a Boeing 747-400 |
| Fuel burn for a specific duration | 5-hour flight: 18,000 gallons for a Boeing 747; 23,000 gallons for an Airbus A380 |
| Fuel burn for a specific flight | New York to Los Angeles (2,797 miles): 5,325 gallons; assuming 200 passengers, this equates to 27 gallons of fuel per person |
| Fuel burn for a specific flight and aircraft | London Heathrow to Paris Charles de Gaulle (348 km): Air France flight on an A319 aircraft; London Heathrow to Hong Kong (5,500 km): Cathay Pacific flight on an Airbus A350 |
| Fuel burn stages | Taxi out, take-off, climb, cruise, approach, and taxi in |
| Fuel burn for different stages | Shortest flights: 2%-17% for taxi out or taxi in; London Heathrow to Hong Kong: 96% for cruising; London Heathrow to Dubai: 95% for cruising; London Heathrow to Paris: 62% for cruising; London Heathrow to Edinburgh: 68% for cruising |
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Factors influencing fuel consumption
Several factors influence the fuel consumption of a commercial airliner. Here are some key considerations:
Aircraft Design and Technology
The design and technology employed in an aircraft significantly impact its fuel efficiency. Modern aircraft like the Airbus A321neo are designed to be more fuel-efficient, with advancements in aerodynamics, engine technology, and weight reduction. For instance, Airbus has developed aircraft designs with twin rear-mounted counter-rotating propfans, which offer improved efficiency. Additionally, the installation of wingtip devices, such as winglets or blended-winglets, can reduce fuel burn by improving lift-induced drag.
Flight Stage and Duration
Different stages of a flight have varying fuel requirements. While take-off is often associated with high fuel consumption due to the engines working at maximum thrust, it contributes a relatively small fraction to the overall fuel burn, especially on longer flights. The cruise stage, where the aircraft maintains optimum airspeed and altitude, typically demands the most fuel. However, on shorter flights, the non-cruising stages, such as taxiing, takeoff, climb, and approach, can account for a more significant proportion of total fuel usage.
Load Factors and Aircraft Size
The weight and load factors of an aircraft influence fuel efficiency. A heavier aircraft requires more fuel to generate lift and propel itself forward. Load factors include seating density, passenger load, and cargo weight. Airlines use yield management to optimize load factors, thereby improving fuel efficiency. Additionally, larger aircraft with more seats, such as the Airbus A380, can achieve better fuel efficiency per passenger due to increased capacity.
Operational Procedures and Routing
Operational procedures, including maintenance practices and routing decisions, can impact fuel consumption. Efficient maintenance practices can contribute to fuel savings. Regarding routing, direct routes typically optimize fuel efficiency, although factors like air traffic control systems and airspace restrictions can influence the actual flight path. Additionally, in certain scenarios, making a halfway stop to refuel during long-haul flights can be more fuel-efficient than a non-stop flight, despite the energy losses during descent and climb.
Flight Distance and Duration
Longer flights that cover greater distances generally consume more fuel. The distance-to-fuel-efficiency relationship is not linear, as longer flights may have higher fuel efficiency per mile due to the cruise stage becoming a more significant factor. However, short-haul flights, typically below 1500 kilometers, tend to have higher fuel consumption per mile due to the higher proportion of fuel burned during takeoff and climb stages.
These factors collectively influence the fuel consumption of commercial airliners, and airlines continuously work to optimize these variables to improve fuel efficiency and reduce environmental impact.
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Fuel efficiency
The fuel efficiency of an airline depends on various operational factors such as fleet fuel burn, seating density, air cargo, and passenger load factor. For instance, the average airline fuel consumption per passenger in Europe in 2017 was 3.4 L/100 km, a 24% improvement from 2005. However, due to a 60% increase in traffic, CO₂ emissions rose by 16% to 163 million tonnes.
Aircraft type and flight duration also play a significant role in fuel consumption. For example, shorter flights using a Boeing 737-800 consume about 2.5-3 tons of fuel per hour, while a Boeing 747-400 burns approximately 10-11 tons of fuel per hour. The Airbus A380, the largest passenger aircraft, consumes about 11-12 tons of fuel per hour, translating to 4,600 gallons of fuel per hour.
The fuel burn per kilometre is another critical factor in fuel efficiency. The A321neo, one of the newest aircraft, averages 2.7 litres of fuel per kilometre. However, it's important to note that fuel burn per kilometre doesn't account for aircraft size and capacity. Shorter flights have a higher proportion of fuel burn for taxiing, while longer flights, such as to Hong Kong, burn most of their fuel during the cruise.
To improve fuel efficiency, Airbus has proposed biomimicry, suggesting that aircraft flying in formation, similar to migrating birds, can save 5-10% of fuel. Airbus A380 tests demonstrated a 12% savings, and further trials with two Airbus A350s are planned.
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Fuel burn
Different aircraft models have varying fuel consumption rates. For instance, the Airbus A320 typically burns around 2.5 tons of fuel per hour, while the Boeing 747-400 burns approximately 10-11 tons per hour. The Airbus A380, one of the largest passenger aircraft, consumes about 11-12 tons or 4,600 gallons of fuel per hour. Shorter flights using the Boeing 737-800 burn approximately 2.5-3 tons of fuel per hour.
The fuel burn per kilometre or per passenger can provide insights into the efficiency of an aircraft. For example, the A321neo, one of the newest aircraft, uses an average of 2.7 litres of fuel per kilometre. In 2018, the average fuel burn for passenger transport was 28 grams of fuel per kilometre or 3.5 litres per 100 kilometres per passenger. In Europe in 2017, the average airline fuel consumption per passenger was 3.4 litres per 100 kilometres, a significant improvement from 2005.
Take-off is often considered the most fuel-intensive stage of a flight. However, the fuel burn during take-off is a relatively small fraction of the total fuel used, especially on longer flights. For instance, on a flight to Hong Kong, cruising accounted for 96% of the total fuel burned, while the flight to Dubai burned 95% of its fuel during the cruise phase. Shorter flights, like the one to Paris, had lower cruise fuel burn percentages, with taxiing and other non-cruising stages contributing more significantly to the overall fuel consumption.
To improve fuel efficiency and reduce emissions, airlines and aircraft manufacturers have implemented various strategies. These include improving aerodynamics, reducing weight, enhancing engine brake-specific fuel consumption, and optimising airspeed and cruising altitudes. Additionally, Airbus has explored flying aircraft in formation, inspired by migrating birds, which could save up to 10% of fuel.
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Fuel costs
The amount of fuel burned by an aircraft depends on several factors, including the aircraft's empty weight, payload, engine efficiency, flight path, and weather conditions. The number of passengers on board also plays a role in fuel efficiency, with higher passenger numbers improving efficiency. Additionally, the length of the flight affects fuel burn, with shorter flights burning proportionately more fuel during taxiing and other non-cruising activities.
The fuel efficiency of aircraft has improved over time, with the average fuel burn of new aircraft decreasing by 45% from 1968 to 2014. This improvement is due to advancements in aerodynamics, weight reduction, and improved engine brake-specific fuel consumption and propulsive efficiency.
To provide some specific examples of fuel consumption, a Boeing 747-400 burns around 10-11 tons (approximately 22,000-24,000 pounds) of jet fuel per hour, while a shorter flight using a Boeing 737-800 would 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 per hour, or 1.3 gallons per second.
To put these numbers into perspective, a transatlantic flight from New York to London, operated by an Airbus A350 XWB, would cost nearly $110,000 in fuel. A five-hour flight on a Boeing 747 would burn 18,000 gallons of fuel, and a similar-length flight on an Airbus A380 would use about 23,000 gallons.
When comparing air travel to driving, it's worth noting that a typical car gets about 25 miles per gallon. For a long-distance trip such as New York City to Los Angeles, a car would use around 112 gallons of gas, resulting in a much higher fuel cost per person than flying.
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Fuel type
The fuel type used by an aircraft is determined by the type of engine it has. Commercial and fighter planes tend to use kerosene-based fuel, with additional products like antifreeze, hydrocarbons, metal deactivators, and antioxidants to prevent corrosion and freezing at high altitudes.
Jet Fuel
The most commonly used jet fuels for commercial aviation are Jet A and Jet A-1, which are produced according to international standards. Jet A is only available in the United States and was developed with a higher flash point and freezing point than standard kerosene. Jet B is another type of jet fuel used in civilian turbine-engine aircraft for its improved performance in cold weather. Jet fuel is a mixture of hydrocarbons, and its composition varies based on the petroleum source. It is defined by its performance specifications, such as freezing and smoke points, rather than a specific chemical compound. Jet fuel is colourless to straw-coloured, with a flash point of 100° Fahrenheit and a freezing point of -52° Fahrenheit.
Avgas
Avgas is sold in lower volumes than jet fuel but to a larger number of independent aircraft carriers. It is used by piston-engined aircraft and is similar to gasoline in its performance. Avgas is dyed and dispensed through nozzles with a diameter of 40 mm (49 mm in the US) to distinguish it from jet fuel.
Biofuels
The aviation industry is exploring the use of biofuels, such as those made from biomass-to-liquid methods, sustainable aviation fuel (SAF), and vegetable oil, to reduce emissions and increase sustainability. Green Flight International became the first airline to fly jet aircraft using 100% biofuel. Other airlines, such as British Airways, Virgin Atlantic, and United Continental Holdings, have also experimented with biofuel blends for their flights.
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Frequently asked questions
The amount of fuel used by a commercial airliner depends on a variety of factors, including the aircraft type, flight duration, empty 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 Boeing 737-800 used on shorter flights may use about 2.5-3 tons per hour. The Airbus A380, the largest passenger aircraft, consumes around 4,600 gallons of fuel per hour.
The fuel burn during a flight can be divided into six stages: taxi out, take-off, climb, cruise, approach, and taxi in. While take-off may be the most intense point of a flight in terms of fuel consumption, it contributes a relatively small fraction to the total fuel usage. For longer flights, cruising typically accounts for a higher proportion of fuel burn.
Aircraft fuel efficiency is often compared to that of cars. On average, a car gets about 25 miles per gallon, while a plane like the Boeing 747 can achieve 100 miles per gallon per person when carrying 500 passengers. This translates to 0.01 gallons per person per mile, making air travel more fuel-efficient per person for long-distance trips with many passengers.
