Regan Brown
The amount of fuel used by planes is a significant concern for airlines, accounting for up to 40% of operating expenses. The fuel efficiency of an aircraft depends on various factors, including the number of passengers, aircraft type, engine efficiency, flight path, and weather conditions. For instance, the Boeing 747 burns approximately 1 gallon (4 litres) of fuel every second, translating to 36,000 gallons over a 10-hour flight. On the other hand, the Airbus A321neo has a fuel burn rate of 0.683 litres per second, or 2,508 litres per hour. With the aviation industry facing economic and environmental pressures, optimising fuel efficiency and reducing consumption are critical.
| Characteristics | Values |
|---|---|
| Fuel burn per kilometer | Depends on the relative aircraft size and capacity |
| Fuel burn per hour | 2,700 gallons (Boeing 787-9), 4,600 gallons (Airbus A380), 18,000 gallons (Boeing 747 quadjet for a 5-hour flight), 23,000 gallons (Airbus A380 for a 5-hour flight), 187,200 litres (Boeing 747 for a 13-hour flight) |
| Fuel burn per second | 1 gallon (Boeing 747), 1.3 gallons (Airbus A380), 4 litres (Boeing 747), 0.683 litre (Airbus A321neo) |
| Fuel burn per mile | 5 gallons (Boeing 747), 12 litres (Boeing 747) |
| Fuel burn per passenger | 0.01 gallons per person per mile (Boeing 747), 27 gallons (for a 200-passenger flight from New York City to Los Angeles) |
| Fuel burn per passenger per 100 km | 3 to 4 litres (industry average), 3.85 litres (Lufthansa), 4.2-4.3 litres (Delta or Emirates) |
| Fuel burn by flight stage | 2-17% (taxi out), 2-17% (taxi in), 4% (take-off), 38% (climb), 52% (cruise), 4% (approach) |
| Fuel cost | $110,000 (for a flight from New York to London, operated by an Airbus A350 XWB) |
| Fuel as a percentage of airline operating expenses | 25-40% |
| Fuel as a percentage of the cost of running an airline | 35-50% (Indian carriers) |
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What You'll Learn
Fuel burn varies by flight stage
The amount of fuel burned by an aircraft varies depending on the stage of the flight. While passengers often assume that take-off consumes the most fuel, due to the loud roar of the engines and the visible effort of getting the plane airborne, this is not the case. In reality, the en-route phase of the flight, specifically the cruising stage after the initial climb, burns the most fuel overall. This is because cruising is typically the longest stage of a flight in terms of time and distance, and the engines are operating more efficiently at this stage due to thinner air reducing drag.
Take-off does, however, burn fuel at the highest rate per minute, as the engines are working their hardest to generate the thrust needed to overcome gravity and reach cruising altitude. The shorter duration of this stage means that its overall fuel consumption is lower. The climb stage also burns fuel at a high rate per minute.
The amount of fuel burned during the taxi stage can also be significant, especially on shorter flights where it can account for up to 17% of total fuel use. This has led many airlines and airports to use tugs or electric motors to move aircraft while on the ground, rather than burning kerosene.
The fuel consumption of a flight can be broken down into six stages: taxi out, take-off, climb, cruise, approach, and taxi in. The relative contribution of each stage to total fuel use depends on the length of the flight. For example, on a long-haul flight to Hong Kong, cruising can account for 96% of total fuel burned, whereas on a shorter flight to Paris, this figure drops to 62%.
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Jet fuel costs and emissions
Jet Fuel Costs
Jet fuel costs make up nearly 25-40% of an airline's operating expenses, and these costs are passed on to passengers in the form of ticket prices. The actual fuel consumption of a jet aircraft depends on various factors, including the aircraft's empty weight, payload, engine efficiency, flight path, and weather conditions. For example, a Boeing 747 burns approximately one gallon of fuel per second, resulting in 18,000 gallons of fuel burned during a five-hour flight. The Airbus A380, the largest passenger aircraft, consumes even more fuel due to its higher capacity.
Global jet fuel prices have been rising in recent years, with the average price per gallon reaching $6.46. As a result, a transatlantic flight from New York to London can cost an airline nearly $110,000 in fuel. To manage fuel costs, airlines can employ fuel hedging strategies, which protect them from extreme price fluctuations.
Jet Fuel Emissions
The aviation industry is facing the challenge of reducing its greenhouse gas emissions while addressing the increasing demand for air travel. Jet fuel combustion contributes about 2% of global anthropogenic greenhouse gas emissions. To achieve carbon-neutral growth, the industry must focus on technology, operations, infrastructure improvements, and, most importantly, reducing aviation fuel life cycle emissions.
The specific emissions associated with jet fuel depend on the type of fuel used. Conventional petroleum-based jet fuel has a baseline life cycle greenhouse gas emissions value of 89.0 gCO2e MJ−1. However, this value varies by region, ranging from 81.1 to 94.8 gCO2e MJ−1. Sustainable aviation fuel, such as biomass-based or power-to-liquid fuel, can reduce emissions by up to 80-90% compared to conventional jet fuel.
To promote sustainability and address climate change concerns, the International Civil Aviation Organization has set emissions reduction goals and developed processes to calculate the baseline life cycle greenhouse gas emissions of jet fuel. Additionally, the Carbon Offsetting Scheme for International Aviation provides a global program to consolidate emissions reduction measures.
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Fuel efficiency by airline
Fuel efficiency is a critical factor in the success of airlines, and improving it can significantly impact their profitability. Fuel is one of the largest expenses for airlines, accounting for up to 30% of their operating costs. Therefore, improving fuel efficiency is essential for airlines to reduce their costs and environmental impact.
Several strategies can be employed by airlines to improve fuel efficiency:
- Investing in newer, more fuel-efficient aircraft: Newer aircraft are designed to be more aerodynamic, lighter, and more fuel-efficient than older models. Replacing older aircraft with newer models can save airlines up to 20% on fuel costs.
- Implementing operational efficiencies: Airlines can optimize flight routes, reduce idle time on the ground, and use more efficient taxiing methods to lower fuel consumption. For instance, using electric motors or tugs to move aircraft on the ground instead of burning kerosene can reduce fuel burn.
- Optimizing flight plans: Airlines can optimize flight plans by reducing weight on board, improving engine performance, and choosing more efficient routes.
- Reducing carbon footprint: Airlines can invest in renewable energy sources and implement programs to reduce their carbon footprint.
Some airlines have successfully implemented fuel-saving initiatives and improved their fuel efficiency:
- Delta Airlines: Delta has implemented a comprehensive fuel efficiency program, including the use of more fuel-efficient aircraft, optimizing flight plans, reducing weight on board, and improving engine performance. These measures have helped Delta reduce its fuel consumption by 8 billion gallons since 2000, resulting in over $20 billion in cost savings.
- Southwest Airlines: Southwest has implemented several fuel-saving initiatives, including using more fuel-efficient aircraft, optimizing flight plans, and reducing weight on board. These efforts have led to a reduction of 3.5 billion gallons in fuel consumption since 2000, saving the airline over $10 billion.
- United Airlines: United has also focused on fuel efficiency by adopting more fuel-efficient aircraft, optimizing flight plans, and reducing weight on board. Additionally, they have invested in renewable energy sources and implemented carbon footprint reduction programs. As a result, United has reduced its fuel consumption by 4.4 billion gallons since 2000, saving over $12 billion in costs.
- American Airlines: American Airlines has reduced its fuel consumption by 5.5 billion gallons since 2000, saving over $15 billion, through the use of newer, more fuel-efficient aircraft and carbon footprint reduction programs.
- GOL and TAP Air Portugal: These airlines are the first to adopt FuelIS, an analytical tool developed by the International Air Transport Association (IATA) to improve fuel efficiency. FuelIS integrates with the Fuel Efficiency Gap Analysis (FEGA) system and allows airlines to compare their fuel efficiency performance against industry averages, helping identify cost-cutting and environmental improvement opportunities.
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Fuel efficiency by aircraft type
Fuel efficiency in aircraft is a measure of the transport energy efficiency of an aircraft. Fuel efficiency is increased by improving aerodynamics, reducing weight, and improving engine brake-specific fuel consumption and propulsive efficiency or thrust-specific fuel consumption.
The fuel economy of an aircraft depends on several factors, including the aircraft's empty weight, payload, efficiency of the engines, flight path, and weather conditions. The number of seats and the capacity of an aircraft also play a role in fuel efficiency. For example, the Airbus A380, which has a higher capacity than the Boeing 747, consumes slightly more fuel.
The stage of flight also affects fuel efficiency. The six stages of flight in terms of fuel burn are taxi out, take-off, climb, cruise, approach, and taxi in. The shorter the flight, the more fuel burn is attributed to non-cruising activities. However, on longer flights, such as to Hong Kong, cruising can account for up to 96% of total fuel burned.
When comparing different aircraft types, several models stand out for their fuel efficiency. Here are some examples:
- Airbus A350: This wide-body aircraft from Airbus offers high fuel efficiency, carrying more passengers over long distances. It has a range of 16,100 km, which surpasses its competitor, the B787-10, by a significant margin.
- Boeing 787-9: Boeing generally tops Airbus in fuel efficiency comparisons, and the 787-9 is no exception. It burns approximately 2,700 gallons of fuel per hour, which is less than the Airbus A380.
- Boeing 777X series: Although not yet released, Boeing's upcoming 777X series is expected to raise the bar for fuel efficiency, passenger capacity, and cargo capacity.
- Light aircraft: Some light aircraft, such as the Aeromarine Merlin PSA, Flight Design F2, and Remos GX, offer impressive fuel efficiency, with nautical miles per gallon ranging from 23.2 to 28.3.
- Fuel-efficient jets: The Cessna 172P, Cirrus SR20, Tecnam P2006T, Diamond DA-62, and Piper PA44 Seminole are known for their relatively high fuel efficiency within their categories.
- Wingtip devices: Airbus has utilized wingtip devices, such as wingtip fences and Sharklet blended-winglets, which can increase fuel efficiency by reducing lift-induced drag and improving the lift-to-drag ratio.
- Boeing 737-800s: Among large commercial jets, the Boeing 737-800s benefit the most from winglets, with an average efficiency increase of 6.69%.
It's worth noting that new technologies and aircraft designs are constantly evolving to improve fuel efficiency and reduce environmental impact. Additionally, the use of electric motors and ground-based power sources during taxiing can further enhance fuel efficiency and reduce unnecessary fuel burn on the ground.
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Fuel efficiency by distance
Fuel efficiency in aviation is typically measured by how effectively an aircraft uses fuel to cover a certain distance. The total fuel efficiency of an aircraft depends on several factors, including the aircraft's empty weight, payload weight, engine efficiency, flight path, and weather conditions.
The fuel efficiency of an aircraft can be calculated using the formula: Fuel Burn per Passenger Mile. This formula calculates the amount of fuel consumed for each mile travelled by each passenger. This formula helps airlines understand how efficiently fuel is being used relative to the number of passengers and the distance travelled. For example, a Boeing 747 burns approximately 5 gallons of fuel per mile. However, considering that a 747 can carry up to 568 people, the fuel efficiency per person becomes significantly better, at 0.01 gallons per person per mile, or 100 miles per gallon per person.
Another factor that affects fuel efficiency is the distance of the flight. Longer flights tend to have a lower average fuel burn per mile. This is because once the aircraft reaches cruising altitude, it can maintain a more efficient fuel burn rate. Additionally, the shorter the flight, the more proportionally that non-cruising activities such as taxiing, take-off, and landing contribute to overall fuel consumption. For example, on a flight to Paris, cruising accounts for 62% of overall fuel burn, while on a longer flight to Hong Kong, cruising uses up 96% of the total fuel burned.
To improve fuel efficiency, aircraft manufacturers and airlines employ various strategies. Enhancements in aircraft design, such as the development of fuel-efficient engines, the use of advanced materials, and the incorporation of wingtip devices, can reduce drag and improve aerodynamic performance, leading to lower fuel consumption. Airlines can also improve fuel efficiency by optimising load factors and flight operations, such as by increasing seat density and maximising the number of seats occupied.
By improving fuel efficiency, the aviation industry can achieve both economic and environmental benefits. Reducing fuel burn leads to lower operating costs for airlines and contributes to a greener planet by lowering greenhouse gas emissions.
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Frequently asked questions
This depends on several factors, including the aircraft's empty weight, payload, engine efficiency, flight path, and weather conditions. For instance, a Boeing 747 uses about 1 gallon (4 litres) of fuel every second, burning 36,000 gallons (150,000 litres) over a 10-hour flight.
The amount of fuel used depends on the type of aircraft, its weight, payload, engine efficiency, flight path, and weather conditions. Shorter flights burn more fuel during taxiing, take-off, and landing, while longer flights burn more fuel during the cruise.
A typical car gets about 25 miles per gallon, while a plane like the Boeing 747 gets 100 miles per gallon per person when carrying 500 people. This means that planes are more fuel-efficient per person than cars, especially on long-haul flights.
The fuel burn can be broken down into six stages: taxi out, take-off, climb, cruise, approach, and taxi in. For shorter flights, the non-cruising stages contribute more to total fuel use, while for longer flights, the cruise stage dominates fuel burn.
