The aviation industry is currently patting itself on the back for a "green" revolution that doesn't exist. If you follow the mainstream tech press, you’ve seen the headlines: internal combustion is dead, electric planes are the savior, and hydrogen is the fuel of the decade. They want you to believe that the roar of a piston or a turbine is a relic of the past, destined to be replaced by high-density batteries and whisper-quiet motors.
They are lying to you.
The "ICE heads to the airport" narrative usually suggests that the internal combustion engine is being phased out in favor of cleaner alternatives. In reality, attempting to prematurely kill the ICE in aviation is the most dangerous, expensive, and scientifically illiterate move the industry has ever made. We aren't moving toward a cleaner future; we are moving toward a massive infrastructure collapse that will make air travel a luxury for the ultra-rich while doing almost nothing for the planet.
The Energy Density Lie
Let's talk about the math that the "electric flight" crowd refuses to acknowledge. The energy density of jet fuel (Jet A-1) is roughly $43$ MJ/kg. Current lithium-ion batteries? About $0.9$ MJ/kg.
Even if we assume electric motors are three times more efficient than heat engines, you still need a battery that weighs fifty times more than the fuel it replaces to get the same range. In a car, weight is a nuisance. In a plane, weight is the enemy of physics. Every extra kilogram of battery requires more wing surface, which creates more drag, which requires more battery. It is a death spiral of engineering.
I have sat in boardrooms where executives talk about "regional electric mobility" as if it’s a solved problem. It isn't. When you burn fuel, the plane gets lighter. When you drain a battery, the plane stays just as heavy. You are carrying "dead weight" all the way to the runway. Until we see a $10x$ jump in battery chemistry—which hasn't happened in a century—the ICE isn't "heading to the airport" to retire. It's staying there because it's the only thing that actually works.
Sustainable Aviation Fuel is a Shell Game
The second pillar of this "disruption" is Sustainable Aviation Fuel (SAF). The argument is simple: keep the engines, swap the fuel. It sounds like a win-win.
It’s a fantasy.
The current global production of SAF meets less than 0.1% of total jet fuel demand. To scale SAF to a level that matters, we would need to convert massive swaths of agricultural land into biofuel feedstock, driving up food prices and causing more deforestation than the carbon we’re trying to save.
Industry insiders love SAF because it allows them to claim "net-zero" goals while continuing business as usual. But the cost is staggering. SAF is currently three to five times more expensive than fossil-derived kerosene. If you think your summer flight to Europe is expensive now, wait until the airline is forced to pass a 400% fuel surcharge onto your ticket.
The Precision of the Piston
While the world chases the shiny object of electrification, they are ignoring the massive gains still available in traditional combustion. The "lazy consensus" says ICE development has peaked. That is objectively false.
We are seeing a resurgence in compression-ignition (diesel) engines for general aviation that are $30%$ to $40%$ more efficient than the leaded-gasoline engines designed in the 1960s. Companies like Diamond Aircraft have been quietly proving that you can fly further, faster, and cleaner using refined ICE technology.
The real disruption isn't removing the engine; it’s perfecting it. We should be obsessed with:
- High-compression ratios that squeeze every joule out of the fuel.
- Opposed-piston designs that eliminate heavy cylinder heads.
- Advanced ceramics that allow engines to run hotter and more efficiently without melting.
Instead, we are diverting billions in R&D into battery startups that will likely go bankrupt before they ever clear FAA certification.
The Hydrogen Mirage
Hydrogen is the latest "savior" being paraded through airport terminals. Yes, hydrogen has incredible energy density by mass. But its energy density by volume is a nightmare.
To store enough hydrogen to power a long-haul flight, you either need massive, heavy pressurized tanks or cryogenic cooling systems that keep the fuel at $-253$°C. You can't store hydrogen in the wings like we do with jet fuel. You have to put it in the fuselage.
Imagine a plane where half the cabin is a giant thermos of liquid hydrogen. You’ve just cut your passenger capacity in half. To maintain the same profit, the airline has to double the ticket price. Hydrogen isn't a solution for the masses; it's a niche experiment that ignores the brutal economics of the sky.
The Hidden Cost of the "Clean" Hangar
The industry ignores the "embedded carbon" of this transition. Building a fleet of electric or hydrogen planes requires a complete overhaul of global airport infrastructure. Every gate would need high-voltage charging or hydrogen liquefaction plants.
The environmental cost of mining the cobalt, lithium, and rare earth metals for "clean" aviation would be an ecological catastrophe in its own right. We are traded a carbon problem for a mining and toxic waste problem, all while pretending we're saving the clouds.
Stop Trying to Fix the Engine (Fix the System)
The obsession with replacing the internal combustion engine is a distraction from the real inefficiencies in aviation. If you want to reduce emissions, look at Air Traffic Control (ATC).
The way we fly planes today is idiotic. Because of outdated ATC systems, planes are forced to fly "highways in the sky" that aren't direct, and they spend hours idling on taxiiways or circling in "holding patterns" because of congestion.
If we moved to satellite-based, AI-optimized routing, we could cut aviation emissions by $10%$ to $15%$ tomorrow—without changing a single engine. But fixing bureaucracy isn't as sexy as announcing a "flying Tesla," so the ICE remains the scapegoat.
The Infrastructure Trap
Airports are 50-year assets. The planes being sold today will be flying in 2050. When a competitor tells you the ICE is "heading to the airport" for its final bow, they are ignoring the reality of the supply chain.
There is no "plug-and-play" replacement for the thousands of tankers, pipes, and storage vats that move liquid fuel. Liquid fuel is the most elegant energy distribution system ever devised. It's stable, it's energy-dense, and it's portable. Replacing it with an electrical grid that is already struggling to stay upright in a heatwave is a recipe for a grounded global economy.
The Reality Check
I’ve spent years watching startups pitch "revolutionary" propulsion. They always show a sleek, CGI render of a vertical takeoff craft. They never show the weight calculations. They never show the battery degradation after 500 cycles of rapid charging. They never talk about the insurance premiums for a giant flying battery pack.
The internal combustion engine is the only reason global trade and tourism exist. It is a masterpiece of thermal engineering that we are discarding because of a political trend, not a scientific one.
The superior path is not the elimination of the ICE, but the "Hard Pivot" toward ultra-efficient, multi-fuel combustion systems. We need engines that can run on anything from waste-derived synthetic paraffin to traditional kerosene, operating at thermal efficiencies we haven't even touched yet.
The people telling you the ICE is dead are usually the ones trying to sell you a stock IPO for a company that hasn't cleared a wind tunnel test. Don't buy the hype. The roar of the engine isn't a funeral dirge; it's the sound of a technology that is still the only thing keeping us in the air.
If you want to save the planet, stop subsidizing battery-powered toys and start funding the engineers who can make a piston engine do things we thought were impossible. The ICE isn't leaving the airport. It's waiting for the dreamers to wake up and realize physics doesn't care about your ESG report.
Go back to the drawing board. Focus on the thermal limits. Forget the batteries.
