How much energy does flying use?

A plane like a Boeing 747 uses approximately 1 gallon (about 4 liters) of fuel every second. Over the course of a 10-hour flight, it might burn 36,000 gallons (150,000 liters). The 747 burns approximately 5 gallons of fuel per mile (12 liters of fuel per kilometer).



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A plane like a Boeing 747 uses approximately 1 gallon (about 4 liters) of fuel every second. Over the course of a 10-hour flight, it might burn 36,000 gallons (150,000 liters). The 747 burns approximately 5 gallons of fuel per mile (12 liters of fuel per kilometer).

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In 1970, flying was twice as energy intensive as driving, but that has reversed. In 2012, the most recent year counted, driving one person one mile took 4,211 BTUs, while flying required just 2,033.

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In fact, the average plane trip has been more fuel efficient than the average car trip since as far back as 2000, according to their calculations.

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Emissions from flights stay in the atmosphere and will warm it for several centuries. Because aircraft emissions are released high in the atmosphere, they have a potent climate impact, triggering chemical reactions and atmospheric effects that heat the planet.

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For the shortest trip, driving is slightly more economical than flying. But for the longer cross-country trip, flying is far cheaper. And keep in mind that this only considers solo drivers. Families or friends traveling in one vehicle can save money by driving, even on longer routes.

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The B747-400, best known as the world's fastest commercial jetliner, has the capability of carrying up to 660 passengers in a partial double deck configuration. The average hourly rental rate of the Boeing 747-400 is around 30,950 USD per hour.

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Simply add the strength of the headwind (30 mph) to your best glide speed (78 mph) and you've got the most efficient speed to fly—here, 108 mph. To determine an airplane's Carson speed, multiply its best glide speed by 1.32. This will get the best result in terms of true airspeed and fuel consumption.

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When an airplane experiences less drag, it consumes less fuel. This relationship between speed and fuel consumption means that flying at a slightly slower speed can result in significant fuel savings for airlines, which in turn can lower operating costs and potentially reduce ticket prices for passengers.

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The amount of radiation is minuscule, and jet lag can usually be overcome in a few days. But for anyone flying dozens of times per year — say, at least two cross-country flights per month — these stresses start to add up, putting frequent fliers in higher risk categories for cancers and other chronic health issues.

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Jet belly: (noun) the bloated state in which your stomach inflates post-flight. Also, a very unpleasant feeling. May also make you look like you're 3 months pregnant. So how does one prevent this jet belly? Well, it all depends on what you eat on the plane.

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The dry air and low air pressure in long flights is dehydrating. “Dehydration due to low humidity levels in the cabin can slow down digestion and worsen constipation and preexisting IBS symptoms,” Surapaneni explains.

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It's not just your imagination – flying in an airplane can zap your energy, dry your skin and make various body parts feel different or weird. How come? “The pressure, temperature and oxygen levels in the cabin fluctuate, and the humidity level is lower than it is at sea level,” says Matthew Goldman, MD.

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