Ameer Randolph
The amount of fuel used by airplanes each day is a significant topic, with commercial airlines consuming 95 billion gallons of fuel in 2019, pre-pandemic. In 2020, fuel consumption dropped to 52 billion gallons, but it began to rise again in 2021, projected to reach 99 billion gallons by 2024. This increase in fuel consumption has sparked interest in more fuel-efficient aircraft, with jet aircraft being the most common type of plane in use today. The amount of fuel burned by an aircraft depends on various factors, including the type of aircraft, its weight, payload, engine efficiency, flight path, and weather conditions. For example, a Boeing 747 burns one gallon of fuel every second, while the Airbus A380, the largest passenger aircraft, consumes 4,600 gallons of fuel per hour.
| Characteristics | Values |
|---|---|
| Fuel used by commercial airlines worldwide in 2019 | 95 billion gallons |
| Fuel used by commercial airlines worldwide in 2020 | 52 billion gallons |
| Fuel used by commercial airlines worldwide in 2021 | 92 billion gallons |
| Fuel used by commercial airlines worldwide in 2023 | 99 billion gallons |
| Fuel used by a Boeing 747 in a 5-hour flight | 18,000 gallons |
| Fuel used by a Boeing 747 in a 10-hour flight | 36,000 gallons |
| Fuel used by an Airbus A380 in a 1-hour flight | 4,600 gallons |
| Fuel used by an Airbus A380 in a 5-hour flight | 23,000 gallons |
| Fuel used by an Airbus A350 to fly to Hong Kong | 6.0 litres/km |
| Fuel used by an Airbus A319 to fly to Paris | 14 litres/km |
| Fuel used by an A321neo | 2.7 litres/km |
| Percentage of fuel burn during taxi out or taxi in activities | 2-17% |
| Percentage of CO2 emissions from the transport sector due to aviation | 12% |
| Percentage of CO2 emissions from the transport sector due to road transport | 74% |
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What You'll Learn
Fuel efficiency varies by aircraft type, engine, and weight
Fuel efficiency in aircraft is a measure of transport energy efficiency. It is increased by better aerodynamics, reduced weight, and improved engine brake-specific fuel consumption (BSFC) and propulsive efficiency or thrust-specific fuel consumption (TSFC).
Aircraft with four engines, or "quads", tend to be less fuel-efficient than twinjets due to inherent design factors such as higher wing weight and smaller engine fan diameters. In addition, quad aircraft operated with relatively fewer passengers over the Pacific in 2016 compared to twinjets due to lower seating densities and passenger load factors. Overall, very large four-engine aircraft used on transpacific flights had 24% lower fuel efficiency per passenger than aircraft with two engines in 2016.
The type of aircraft engine also affects fuel efficiency. Shaft engines, which include piston engines and turboprops, have efficiency that is inversely proportional to their brake-specific fuel consumption. Jet engines, on the other hand, have efficiency given by their airspeed divided by the thrust-specific fuel consumption and the specific energy of the fuel. Turboprops have an optimum speed below 460 miles per hour (740 km/h), which is less than the jets used by major airlines today. However, propeller planes are much more efficient.
The weight of an aircraft also plays a significant role in fuel efficiency. As weight indirectly generates lift-induced drag, minimizing weight leads to better aircraft efficiency. For a given payload, a lighter airframe generates lower drag. Minimizing weight can be achieved through the airframe's configuration, materials science, and construction methods. A reduction in airframe weight enables the use of smaller, lighter engines, which in turn reduces the fuel load for a given range and payload. It is estimated that a reduction in fuel consumption of about 0.75% results from each 1% reduction in weight.
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Fuel-saving measures and aircraft design
Fuel is often the single largest cost for aircraft operators, and experts estimate that every pound of a plane’s weight totals up to approximately $10,000 in annual fuel costs. Therefore, reducing aircraft weight is a major priority for airlines, militaries, and aircraft designers.
Weight reduction
Aircraft engineers are experimenting with innovative designs and materials to reduce weight and increase fuel efficiency. Carbon-fiber composites, for instance, are lighter than aluminum alloys, and using them to build wings can cut fuel consumption by 5%. Titanium, carbon fiber, and other composite plastics are also used to reduce weight.
Drag reduction
Reducing drag is another way to improve fuel efficiency. Winglets, or small surfaces that lift air vertically, are being installed to minimize the amount of air that flows around the wingtip. Thicker fuselages and longer, slimmer wings can also increase airflow and reduce drag. A concept under development at NASA, called the “double bubble” D8, relocates the aircraft’s engine to the top of the plane toward the tail, significantly decreasing drag and increasing fuel efficiency.
Engine improvements
New engine designs are also helping to reduce fuel consumption. For example, Honeywell’s hybrid-electric turbogenerator runs partially on electricity, reducing the use of traditional fuel. Higher pressure and bypass ratios, geared turbofans, open rotors, and hybrid electric or fully electric propulsion can also reduce fuel consumption.
3D printing
The aviation industry has also begun using 3D printing technology to reduce weight and increase customization and construction efficiency.
Navigation improvements
Replacing traditional airplane navigation plans with real-time updates can help aircraft avoid unfavorable weather conditions and take advantage of favorable conditions, reducing fuel burn and lowering emissions.
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Jet fuel vs. aviation gasoline
Jet fuel and aviation gasoline (AvGas) are two distinct types of fuel used in the aviation industry. They differ in terms of their composition, characteristics, and applications.
Jet Fuel
Jet fuel is a type of aviation fuel used in turbine-engine aircraft, including commercial airliners, cargo planes, military jets, and helicopters. It is made from refined kerosene, which is a heavier and more refined oil-based product. Jet fuel is clear or light straw-colored, and its high energy density makes it suitable for long-distance flights at high speeds. Jet A and Jet A-1 are common types of jet fuel. Jet A-1 has a lower freezing point, making it suitable for long-haul international flights. Jet fuel is also used in jet engines, which operate at higher temperatures and pressures than piston engines.
Aviation Gasoline (AvGas)
AvGas, short for aviation gasoline, is a high-performance gasoline used primarily by piston-engine aircraft. These aircraft fly at lower altitudes and slower speeds than jet-powered planes. AvGas is designed to meet the unique requirements of piston engines, offering greater performance and reliability than standard gasoline. It is commonly found in small, general aviation aircraft, such as single-engine planes, and is often dyed blue or green to distinguish it from automotive gasoline. AvGas contains lead components that act as anti-knocking agents to protect the engines from pre-ignition or knocking. However, the presence of lead raises environmental concerns due to its toxicity to humans, animals, and plants.
Comparison
Jet fuel and AvGas differ in their engine compatibility, with jet fuel designed for turbine engines and AvGas for piston engines. Jet fuel is typically used in larger aircraft that fly at higher altitudes and speeds, while AvGas is used in smaller, slower aircraft. Jet fuel has a higher energy density and is more efficient for long-distance flights. On the other hand, AvGas offers greater performance and reliability for piston engines. In terms of environmental impact, jet fuel tends to produce higher emissions due to the high altitudes at which commercial jets operate.
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Global fuel consumption statistics
These numbers highlight the dynamic nature of fuel consumption in the aviation sector, influenced by factors such as travel demand and global events. Additionally, fuel consumption varies across different types of aircraft. For instance, a Boeing 747 burns approximately 36,000 gallons of fuel during a 10-hour flight, translating to 5 gallons per mile or an impressive 100 miles per gallon per person when considering a passenger capacity of 500 people.
On the other hand, the Airbus A380, the world's largest jet airliner, is even more fuel-efficient. It burns around 4,600 gallons of fuel per hour, with a maximum capacity of over 800 passengers. This results in a 20% increase in per-passenger fuel efficiency compared to the Boeing 747.
To put these numbers into perspective, consider a flight from New York City to Los Angeles, covering 2,797 miles. Driving this distance in a typical car would require about 112 gallons of gas for two passengers, whereas flying with 200 passengers would consume 5,325 gallons of jet fuel, resulting in 27 gallons per person.
While these statistics provide a snapshot of global fuel consumption in the aviation industry, it's worth noting that fuel efficiency has been a focus for improvement. Modern jet aircraft are twice as fuel-efficient as the earliest jet airliners, and operational procedures and maintenance practices can significantly impact fuel savings. Additionally, the use of lightweight materials and improved aircraft design contribute to reducing fuel consumption.
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Carbon emissions and sustainability
Aviation is a crucial sector for global connectivity, but it significantly contributes to climate change. The industry accounts for 2.5% of human-induced CO2 emissions and 3.5% of overall human-made changes to the energy balance in the Earth's atmosphere. Commercial air travel is the primary source of these emissions, with military and general aviation contributing smaller amounts. Aircraft are a rapidly growing source of emissions within the transportation sector, surpassing the power sector as the largest source of US carbon dioxide emissions.
To address these environmental concerns, the aviation industry has set ambitious targets. For instance, IATA and its members have committed to achieving net-zero CO2 emissions by 2050. This target is in line with the International Civil Aviation Organization's (ICAO) goal of carbon-neutral growth from 2020 onwards, which was formally adopted in 2010. ICAO serves as a global forum to develop policies and standards for the industry, including measures to address greenhouse gas emissions.
To achieve these goals, the industry is exploring various strategies and technologies. One approach is to improve fuel economy through aerodynamic design, advanced engines, and weight reduction. For example, using lightweight materials such as titanium, carbon fiber, and composite plastics can reduce weight and, consequently, fuel consumption. Additionally, optimized flight routes, altitude and speed management, and reduced runway idling can also enhance fuel efficiency.
Another strategy is the use of sustainable aviation fuel (SAF), which offers a greener alternative to traditional jet fuel. SAF is compatible with current aircraft and can significantly reduce greenhouse gas emissions and improve air quality. It is produced from raw materials such as fats, oils, sugars, municipal waste, and captured CO2. However, the high costs and sustainability concerns of SAF, as well as the limited capabilities of alternative technologies like hydrogen and electric aircraft, present challenges.
Furthermore, policy approaches and market-based mechanisms are crucial in attaining aviation emissions standards. While ICAO has outlined three central environmental goals, including reducing the impact of aviation emissions on local air quality and global climate, a single framework agreed upon by all countries is still lacking. The proliferation of unilateral regulations and taxes, such as the UK Passenger Duty and German Departure Tax, underscores the need for a standardized Market-Based Measure (MBM) to prevent a patchwork of inconsistent regulations.
In conclusion, while the aviation industry plays a significant role in global connectivity, it also contributes substantially to climate change. To address this issue, the industry has set targets for reducing emissions and achieving carbon neutrality. These goals can be met through a combination of technological advancements, alternative fuels, and policy interventions. However, challenges such as high costs, infrastructure limitations, and international collaboration must be overcome to ensure the sustainability of the aviation sector.
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Frequently asked questions
The Boeing 747 burns approximately 1 gallon of fuel every second, which amounts to 18,000 gallons in a 5-hour flight.
The global fuel consumption by commercial airlines has been increasing since 2009 and reached a peak of 95 billion gallons in 2019. Due to the pandemic, this number dropped to 52 billion gallons in 2020. In 2021, commercial airline fuel consumption increased again, and it is expected to reach 99 billion gallons by 2024.
The fuel burn during a flight can be divided into six stages: taxi out, take-off, climb, cruise, approach, and taxi in. While the take-off stage uses a relatively small fraction of fuel, the cruise stage accounts for the majority of fuel burned, especially on longer flights.
