Airlines are cutting emissions through newer aircraft, fuller flights, operational efficiency and a gradual shift towards lower-carbon fuels. These measures matter, but aviation demand and limited fuel supply mean that efficiency gains alone do not make flying climate-neutral.
The useful way to assess an airline’s climate claim is to ask what changed, how much it reduced lifecycle emissions, and whether the result is absolute or merely per passenger kilometre.
Where aviation emissions come from
Most flight emissions come from burning jet fuel. Aircraft also create non-carbon-dioxide climate effects at altitude, including contrails and changes in atmospheric chemistry. Airport electricity and ground vehicles matter, but they are smaller than the fuel burned in flight for most airlines.
1. More efficient aircraft and engines
Newer aircraft can use less fuel per seat through improved engines, lighter materials and aerodynamics. Replacing an older fleet takes years and requires large capital investment. The climate benefit also depends on how much the airline expands: lower emissions per passenger do not guarantee lower total emissions.
2. Better operations
- Optimising routes, speeds and altitude to reduce unnecessary fuel burn.
- Reducing aircraft weight and using electric ground equipment.
- Improving air-traffic management and reducing holding or taxi time.
- Matching aircraft size to demand and improving load factors without overstating the benefit.
3. Sustainable aviation fuel
Sustainable aviation fuel, or SAF, can be produced from approved waste, biological or synthetic pathways and used in blends with conventional jet fuel. Its climate value depends on feedstock, energy source, land-use effects and the lifecycle method used. It still releases carbon dioxide when burned, so the claimed benefit comes from the fuel’s lifecycle compared with fossil jet fuel.
The International Energy Agency’s aviation tracking shows that aviation remains difficult to decarbonise. Its 2025 renewables analysis projected rapid SAF growth to 2030, but only a small share of total aviation fuel demand. Supply, cost and credible sustainability criteria remain major constraints.
4. Electric and hydrogen aircraft
Battery-electric aircraft may suit short routes with small aircraft if batteries, airport infrastructure and low-carbon electricity improve. Hydrogen may play a role in new aircraft designs or synthetic fuels, but storage, aircraft redesign, production and distribution are substantial challenges. Neither option is a near-term substitute for most long-haul jet fuel.
5. Carbon markets and removals
Airlines may buy credits or fund carbon removal, but these measures should be reported separately from direct operational and fuel reductions. A credit does not make the physical emissions from a flight disappear. Quality, additionality, permanence and accounting all matter.
How to read an airline climate claim
| Question | What a useful answer includes |
|---|---|
| What is the target? | A base year, scope, interim milestones and absolute as well as intensity measures |
| What reduced emissions? | Fuel saved, fleet change or SAF volume—not only money spent |
| How is SAF counted? | Lifecycle method, feedstock, chain of custody and whether another party claims the same benefit |
| What relies on credits? | The quantity, project type, standard and treatment separate from direct reductions |
| Is growth included? | Total company emissions and forecast traffic, not only per-passenger improvement |
What passengers can do
- Avoid unnecessary flights and combine trips where practical.
- Choose direct routes because take-off, landing and connections add fuel use.
- Use rail or coach where they provide a workable lower-emission alternative.
- Compare transparent emissions information, but treat precise booking estimates as models rather than measurements.
- Support policy and infrastructure that make lower-carbon transport practical.
ICAO’s member states adopted an aspirational goal of net-zero carbon emissions from international aviation by 2050. Meeting it will require much more than voluntary passenger choices. Read our broader guides to greenhouse-gas emissions, sustainable cities and greenwashing when evaluating industry promises.
I agree with some of the points in the article. I also disagree with some.
– I believe that the government should be more focused on punishing the airline companies.
– It’s not up to them to run the innovation, it’s a government task.
– People should have to pay MUCH more for the airplane tickets.
I hear all the time that “oooh, what about if poor people cannot afford to travel?”. Well, guess what. Flying an airplane isn’t something that should cost 20 USD and be affordable to “anyone”. If you struggle to take your family on an airplane, I would strongly suggest that you go and try out some different type of holiday.
Hi Ulrikka, thanks for your comment.
I tend to agree with some of what you’re writing. For instance, flying an airplane is not a part of the “human rights rules”.
On the flipside, IF the government put a heavy tax on airplane tickets, they have to spend that money on eco-friendly affordable transportation methods like trains and more public buses.
Asking “poor people” to stop traveling isn’t very nice.