CORSIA Under Pressure: Why the Aviation Emissions Dispute is Important for Tourists

The global carbon offsetting scheme for international aviation, CORSIA, has found itself at the center of a new dispute: IATA states that airlines lack approved carbon units to meet future obligations, and governments are not releasing a sufficient volume of such credits. For travelers, this sounds technical, but the consequences could be quite practical: more complex climate levies, more expensive long-haul flights, greater regulatory uncertainty, and stricter scrutiny of airlines' "green" travel claims.

The reason for this topic emerged after new statements from IATA and a fresh analysis by Travel Weekly dated June 18, 2026. The industry association effectively warned: if CORSIA does not work on the required scale, the reason will be not only the airlines, but also government procedures. The essence of the problem is that carriers must purchase and cancel special Eligible Emissions Units, or EEUs, but these units must not simply be created on the market, but officially authorized by the countries where the corresponding climate projects are located.

According to IATA, for the first phase of CORSIA, airlines may need approximately 170 to 236 million such units. At the same time, only ten countries as of 2026 have provided available EEUs, and the total volume already released to the market is estimated at approximately 38 million units. Travel Weekly, in its publication, cites a demand benchmark of 213 million units. Even taking the conservative lower end of IATA's estimate, the gap remains large.

What is CORSIA and Why Does It Exist?

CORSIA, or Carbon Offsetting and Reduction Scheme for International Aviation, was agreed upon by governments through ICAO in 2016 as a global market mechanism for international aviation. ICAO describes it as the world's first global market scheme applied to an entire sector. The idea is that international flights generating emissions above a defined baseline are to offset a portion of this growth through approved climate projects.

It is important to understand: CORSIA is not a permit for aviation to simply pay and change nothing. In the logic of ICAO and IATA, offsets are intended to complement other steps: more efficient aircraft, better air traffic organization, airport modernization, the use of sustainable aviation fuel (SAF), and the reduction of unnecessary operational costs. This is why the discussion around CORSIA is linked to the broader topic of aviation decarbonization, which we have already written about in the material on the work of ICAO and IATA on SAF and the impact on airfare prices.

The mechanics of CORSIA are complex, but for a passenger, they can be explained simply. If international aviation grows and technologies and fuel do not provide sufficient emission reductions here and now, airlines must offset a portion of the additional climate footprint through recognized units. These units must meet ICAO criteria, undergo verification, and not be counted twice: for example, simultaneously as a country's contribution to the Paris Agreement and as an aviation offset.

Where the Knot of Problems Lies

The main knot now is not that airlines do not want to buy units. The problem is that such units are not sufficiently available in the correct legal status. Countries where climate projects are implemented must issue permission to use the corresponding reductions for CORSIA and make so-called adjustments to avoid double counting. For governments, this is a sensitive area, because the same reductions may be needed by them to meet their own climate obligations.

IATA launched the Supporting Alliance for CORSIA EEU Supply in June to help countries and the market unlock the supply of such units more quickly. The initial circle of participants included over 30 organizations, including large aviation groups and carriers. According to IATA's estimate, the first phase of CORSIA could direct about 4-5 billion dollars of climate financing, and by 2035, the potential volume could reach 100 billion dollars depending on market prices. But this money will go into climate projects only when countries and the market can formalize credits in a way that is recognized by CORSIA.

A second element of tension is the interaction of CORSIA with regional schemes, primarily the European Union Emissions Trading System (EU ETS). Europe already has its own climate rules for aviation, and airlines have long warned that the overlapping of several mechanisms can increase costs without a proportional environmental effect. This topic intersects with our previous explanation about the risk of more expensive tickets due to EU ETS.

Why a Passenger Might Feel This

For most tourists, CORSIA will not appear as a separate line item on a ticket tomorrow morning. It is much more likely that its impact will be indirect: through the general costs of airlines, regulatory levies, tariff structures, corporate sustainable travel rules, and carriers' decisions regarding routes. If the EEU market remains deficient, prices for high-quality offset units may rise. If the global scheme weakens, countries may more actively promote their own taxes, levies, or emissions trading systems. For the passenger, this means less transparency and a greater difference between rules on different routes.

The most sensitive could be long-haul international routes, where emissions and fuel costs are more significant. Long-haul flights are already under pressure from high fuel prices, a shortage of new aircraft, airspace restrictions, and more expensive financing. In his speech at the 82nd IATA Annual General Meeting, Willie Walsh also emphasized that the average price of aviation fuel in 2026 is expected to be significantly higher, and industry profitability could noticeably decline. In such an environment, even climate costs, which seem small per ticket, become part of a broader price picture.

Travelers who buy complex routes with transfers through several regions should be particularly attentive. The same flight can fall under different rules depending on the point of departure, the airline, the operator's country of registration, the type of route, and the applicable regulatory schemes. This does not mean that the tourist needs to calculate aviation emissions themselves. But it means that they should compare not only the base price, but also the final amount, tariff conditions, levies, change policies, and the transparency of the carrier's environmental claims.

What Will Change for Sustainable Tourism

For the tourism market, this story is important also because trust in sustainable tourism depends on clear rules. If an airline, tour operator, or online service promises climate-responsible travel, the reader must understand what this is based on: real emission reductions, the use of SAF, fleet modernization, route optimization, or the purchase of offset units. Offsets can be a useful tool, but only when they are transparent, verified, and do not replace real reductions.

That is why the current dispute is not just a technical dispute between IATA, ICAO, governments, and the EU. It shows how difficult it is to create global rules for an industry that operates across borders. A tourist may fly out of Europe, transfer in the Persian Gulf, arrive in Asia, and return via another hub. If each region applies a separate logic of climate levies, the system becomes more expensive and less understandable.

On the other hand, abandoning a common scheme would also not be a simple answer. Without CORSIA, international aviation risks receiving even more fragmented regulation, in which each country or block introduces its own levies. For large airlines, this means additional administrative costs. For small carriers, it is a risk of loss of competitiveness. For passengers, it means less predictability in prices and fewer chances to understand exactly what they are paying for.

What to Look for When Planning Travel

In the short term, tourists do not need to postpone trips because of CORSIA. The scheme is not a new ban on flights and does not mean that international flights will suddenly become equally more expensive on all routes. But it is worth considering a few practical things. First, the price of a long-haul flight will increasingly depend not only on fuel and demand, but also on environmental rules. Second, a "green" option in a flight ticket or tour package must be explained specifically: what exactly is being offset, by what standard this is confirmed, and whether it is just a marketing label.

Third, corporate travelers and those who buy tours through agencies should ask about the full cost structure. If there is a climate levy, voluntary offset, or reference to SAF in the tariff, this should be separated from mandatory airport and government levies. Fourth, for complex international routes, it is useful to compare different options not only by travel hours, but also by the number of segments: sometimes a shorter route with one transfer may be not only more convenient, but also more logical from the perspective of emissions.

Conclusion

CORSIA may seem like a topic for regulators and aviation lawyers, but in reality, it is one of those invisible systems that gradually shape the future price of international travel. The new IATA warning is important not because it changes the boarding rules for a flight tomorrow, but because it shows a weak point in the global climate architecture of aviation: airlines have received obligations, but the market of approved units has not yet provided sufficient volume for their fulfillment.

For tourists, the main conclusion is simple: environmental costs of air travel will more and more often be part of the real price of a trip. The best strategy is to look at the full cost of the ticket, read the tariff conditions, not take climate claims at face value, and choose routes taking into account not only the price, but also the transparency of the carrier. If CORSIA can be unlocked, it may become the only understandable framework for international aviation. If not, travelers will likely see more regional levies, more complex rules, and less predictable tariffs.