Quick answer: Commercial and military jets run on kerosene-based turbine fuel, mainly Jet A-1 or Jet A, while small piston aircraft use aviation gasoline (Avgas). A third fuel, Jet B, exists for extreme cold-weather operations, and a growing slice of the industry is now blending in Sustainable Aviation Fuel (SAF). Which one your aircraft needs depends entirely on its engine type, not its size or speed.
In This Article:
- The First Question Every Student Pilot Asks
- Turbine Fuel: Jet A, Jet A-1 and Jet B
- Avgas: The Fuel Behind Every Trainer Aircraft
- Sustainable Aviation Fuel: Where the Industry Is Heading
- Why This Matters If You’re Chasing a Pilot Career
- Frequently Asked Questions
Decoding Which Type of Fuel Is Used in An Airplane
- The First Question Every Student Pilot Asks
I still remember a student on his first walkaround, staring at the fuel truck, asking why it said “Jet A-1” instead of just “fuel.”
And it’s absolutely a fair question for beginners. Most people assume all airplanes drink the same thing, the way every car takes petrol or diesel.
They don’t. Which type of fuel is used in an airplane depends almost entirely on what kind of engine is bolted to it, and getting this wrong isn’t a minor mistake; it’s a grounded aircraft or worse.
Throughout my time around flight lines and training bases, I’ve watched new pilots go from mixing up Jet A and Avgas on a written exam to explaining the difference to their own students a year later.
It clicks fast once you see it laid out properly, so let’s do that.
- Turbine Fuel: Jet A, Jet A-1 and Jet B
Turbine engines, the kind found in airliners, regional jets, turboprops and most helicopters, run on refined kerosene.
Not the kerosene from a hardware shop shelf. A carefully specified, additive-treated version built to survive freezing cruise altitudes and combust reliably at 35,000 feet.
There are three main variants, and pilots need to know all three cold:
- Jet A: The standard fuel across the United States, with a freezing point around -40°C. You won’t find much of it outside North America.
- Jet A-1: the international standard, refined to a lower freezing point of -47°C and built to ASTM D1655 and equivalent specifications. This is genuinely the world’s most-used aviation fuel, and it’s what you’ll fuel up with almost everywhere outside the US.
- Jet B: A wide-cut fuel blending kerosene with gasoline, giving it a freezing point as low as -76°C. It’s more flammable and trickier to handle, so it’s mostly reserved for genuinely brutal cold-weather operations in places like northern Canada and parts of Russia.
Jet A-1’s energy content sits at roughly 43.15 MJ per kilogram, which is one of the small, specific numbers that examiners love to test and that most laypeople have never heard of.
Honestly, once you’ve fuelled a few different aircraft types across a few different countries, the freezing point differences stop being trivial and start feeling like the whole point.
- Avgas: The Fuel Behind Every Trainer Aircraft
If turbine fuel powers the airplanes people fly on holiday, Avgas powers the airplanes people learn to fly in.
Aviation gasoline, or Avgas, is a high-octane, leaded fuel built for piston engines, the kind found in your Cessna 172 or Piper Warrior during flight school.
Unlike jet fuel, which ignites through compression, Avgas needs a spark, exactly like a car engine, but built to a much higher octane tolerance so it doesn’t detonate under high compression.
The main grade still in wide use is Avgas 100LL, “low lead,” dyed blue so ground crews can identify it at a glance.
A few things worth knowing:
- Avgas 100 (dyed green) has more tetraethyl lead and is largely obsolete now.
- Avgas 80 has all but disappeared, kept alive mainly for a handful of vintage aircraft.
- Unleaded alternatives, like G100UL, received FAA approval a few years back and are slowly working their way into wider circulation, though the transition is taking longer than most people expected.
Put jet fuel into a piston engine, or Avgas into a turbine, and neither will run properly; this is one of the very first safety lessons drilled into every student pilot, and for good reason.
Sustainable Aviation Fuel: Where the Industry Is Heading
This is the part of the fuel conversation that’s changed the fastest in the last two years, and it’s worth understanding even as a student, because it’s shaping the industry you’re about to join.
Sustainable Aviation Fuel, or SAF, is a “drop-in” replacement made from renewable feedstocks like used cooking oil or biomass waste. It’s chemically close enough to conventional jet fuel that it can be blended straight into existing fuel systems without modifying the aircraft.
The catch is scale.
According to IATA, SAF production is expected to reach around 2.4 million tonnes globally in 2026, up from 1.9 million tonnes in 2025 and just 1 million tonnes in 2024. That sounds like fast growth, and it is, but it still only works out to roughly 0.8% of total global jet fuel consumption.
Also, Europe’s ReFuelEU mandate requires a 2% SAF blend at EU airports from 2025, climbing steeply toward 70% by 2050, so the pressure to scale up is very real; it’s just not there yet.
Why This Matters If You’re Chasing a Pilot Career
Fuel knowledge isn’t just exam trivia; it’s one of the first ways an instructor or a check pilot gauges whether you actually understand your aircraft, or whether you’ve just memorized a checklist.
If you’re serious about how to become a pilot, especially as an international student weighing up where to actually train, the fuel systems you’ll work with early on, mostly Avgas in trainers, shift toward Jet A-1 the moment you step into turboprops and jets during an internship.
That’s exactly the stage where a structured pathway matters. Programmes that combine flight training with a genuine internship, rather than handing you a licence and 200 hours and wishing you luck, tend to produce pilots who reach turbine time faster and with far less flailing.
AeroCadet’s model, for instance, is built around exactly that gap: guaranteed post-graduation internships across the US and Caribbean that push students toward 1,500 flight hours and a full ATPL, plus a dedicated Pilot Internship Canada pathway through Pitt Meadows base for students who want a Canadian training and visa route.
It’s worth researching properly before you commit, because the difference between a school that teaches you to fly and one that also gets you employed afterwards is, frankly, the difference between a licence gathering dust and an actual airline career.
Conclusion
So, to circle back to which type of fuel is used in an airplane: it comes down to engine type, not aircraft size.
Turbine aircraft run on Jet A-1 (or Jet A in the US, Jet B in extreme cold), piston trainers run on Avgas, and Sustainable Aviation Fuel is slowly, unevenly, working its way into the mix as mandates tighten.
If you’re mapping out how to become a pilot and weighing options like a Pilot Internship Canada route against a US-based programme, understanding these fuel systems early gives you a real head start once you’re sitting in a cockpit instead of a classroom.
AeroCadet’s international ab-initio and internship programmes are built specifically around getting students from first flight to airline-ready, with guaranteed internships, visa support, and mentor pilots who are still flying the line.
If that’s the kind of structured pathway you’re after, it’s worth exploring our programmes and internship options directly.
Frequently Asked Questions
What is the most commonly used aviation fuel in the world?
Jet A-1 is the most widely used aviation fuel globally, refined to a lower freezing point than Jet A and built to international specifications like ASTM D1655, which is why it’s the default at most airports outside the United States.
Can you put car petrol in a small airplane?
No, standard automotive petrol lacks the octane rating and additive package Avgas has, and using it can cause vapour lock or detonation, so it’s neither legal nor safe in certified piston aircraft.
Is Sustainable Aviation Fuel actually used on commercial flights today?
Yes, but only in small blended percentages. SAF made up roughly 0.6% of global jet fuel consumption in 2025 and is expected to reach about 0.8% in 2026, according to IATA figures.
Why does Jet B have such a low freezing point?
Jet B is a wide-cut blend of kerosene and gasoline, which gives it a freezing point as low as -76°C, making it useful in the coldest operating environments, though it’s more volatile and less common than Jet A-1.
Do all pilots need to understand fuel types, or just engineers?
Every pilot needs to know this. Cold, fuel mismanagement, and fuel type errors remain recurring factors in general aviation incidents, and it’s one of the earliest topics covered in any serious flight training programme.
About the author
Written by the AeroCadet Team. Our aviation training consultants and mentors are current and former airline pilots and flight instructors who have flown and fuelled aircraft across piston, turboprop, and jet operations, and who guide our international students through the fuel systems, aircraft performance, and powerplant knowledge required for FAA and ICAO written and practical tests.