IATA: Carbon Credit Supply for Aviation Must Be Accelerated, Otherwise a Bottleneck May Occur

According to a recent announcement from IATA, 50 participants have already joined an international initiative aimed at expanding the supply of high-quality emission units usable within the CORSIA system. At first glance, this news may seem like an industry technical detail, but it is important for Hungarian travelers as well: the climate obligations of airlines, the supply of the carbon market, and the cost structure of flying may influence the pricing of international flights, the credibility of sustainability communication, and the regulatory environment of aviation in the medium term.

The International Air Transport Association, or IATA, announced on June 23 that new governments and market participants have joined the alliance supporting the supply of CORSIA Eligible Emissions Units, or EEUs. According to the announcement, Guyana, Madagascar, the United Kingdom, Zambia, and Zimbabwe signed the Aviation Carbon Market Compact, while the International Emissions Trading Association, the Verified Carbon Market Collaborative, Sylvera, and Airbus also provide support to the program. According to IATA, the alliance's goal is to facilitate the availability of 225-250 million CORSIA-compatible emission units by the spring of 2027.

This does not mean that ticket prices will change overnight, nor does it mean that offsetting alone solves the climate issue of aviation. The significance of the news lies rather in the fact that the regulatory and market background in international aviation is becoming more concrete, in which airlines must manage the emission impact of increasing traffic. Those traveling on long-haul flights from Budapest, Vienna, or other European airports may encounter more frequently in the coming years that sustainability costs and commitments are integrated into the industry's operations.

What is CORSIA, and why is IATA talking about it now?

CORSIA stands for Carbon Offsetting and Reduction Scheme for International Aviation. The system, created within the framework of the International Civil Aviation Organization, aims to manage the growth of net carbon dioxide emissions from international aviation through offsetting mechanisms. According to IATA's summary, airlines have had to report their carbon dioxide emissions related to international flights annually since 2019, and from 2021, an offsetting obligation is also associated with the growth affected in the system.

The essence of the system is that airlines purchase and cancel CORSIA-approved emission units, thereby offsetting the growth in emissions covered by the program. However, the process is not simply about whether there are enough carbon credits on the market. The units must meet strict eligibility criteria defined by ICAO, and host countries must also authorize the use of the given units for CORSIA purposes. This is important because the same emission reduction cannot be counted simultaneously toward a country's national climate goal and an airline's CORSIA obligation.

According to professional materials related to IATA and ICAO, it is precisely this approval and accounting process that causes the current bottleneck. Based on 2026 data, 130 states participate in the CORSIA system, and 134 states are expected from 2027. At the same time, the supply of properly authorized units still falls far short of the expected demand. According to IATA's presentation material, a demand of around 170-236 million tons of carbon dioxide equivalent may arise in the first CORSIA phase, while in June 2026, a supply of approximately 36 million tons was available from ten countries.

What changed with the new announcement?

The June 23 announcement does not introduce new passenger rights, new taxes, or immediate travel rules. Its essence is that the alliance created to expand the CORSIA supply has become larger and more diverse. The joining governments are important from the host country side, because without official authorization of emission units, airlines cannot use them for CORSIA purposes. The joining market participants can help the process from technical, data market, financial, and methodological sides.

The International Emissions Trading Association confirmed in a separate communication that it is joining the alliance. According to the organization, the initiative connects governments, airlines, and carbon market participants to ensure that high-integrity emission units are available for CORSIA. This phrasing is not accidental: in recent years, there has been much debate regarding quality, transparency, and the risk of double counting in carbon markets. For aviation, therefore, it is not merely a quantitative question of having enough units, but a reputational question of whether these units are truly authentic.

Based on IATA's communication, the alliance tries to coordinate the expertise and resources of participants, providing support to host countries for appropriate authorization processes, alignment with national climate goals, and carbon market access. The goal is not to announce a new fee imposed directly on passengers, but to ensure that airlines can actually access the units they may need for CORSIA compliance later.

Why is this important for Hungarian travelers?

Most Hungarian passengers will not see CORSIA as a separate line in the booking process. Nevertheless, it is worth paying attention to the topic, because the costs of international aviation consist of several layers: fuel, airport fees, air traffic control costs, fleet financing, regulatory compliance, sustainability programs, and commercial risks simultaneously affect airline decisions. If the supply of high-quality, CORSIA-compatible units remains tight, it does not necessarily cause an immediate ticket price increase, but it can increase the uncertainty of compliance costs.

This can be particularly significant for longer international trips. Some passengers departing from Budapest Liszt Ferenc International Airport reach North America, Asia, the Middle East, or Africa via European transfers. Many also choose Vienna Airport for long-haul flights. On these routes, the regulatory costs of international aviation may indirectly appear in airline strategies: which routes they strengthen, what capacity they maintain, what price promotions they offer, and what sustainability claims they formulate.

From the passenger's perspective, the most important practical lesson is that claims about "greener flying" should be interpreted precisely. CORSIA does not replace more efficient aircraft, the expansion of sustainable aviation fuels, better route planning, or the development of airport infrastructure. IATA also emphasizes that offsetting does not replace technological, operational, and infrastructural emission reductions. Rather, it is a complementary tool that can play a role in managing short- and medium-term climate goals.

The quality of the carbon market supply is at least as important as the quantity

The carbon credit market is a sensitive area. An emission unit can only be truly authentic if it is clear from which project it originates, according to what methodology it was calculated, who verified it, and that it is not counted twice. In the case of CORSIA, it is particularly significant that the given country officially authorizes the use and manages the emission reduction according to the accounting rules related to Article 6 of the Paris Agreement.

This background explains why it is not enough to simply "produce" many carbon credits. Airlines need units that comply with international rules and whose use does not lead to credibility disputes. If the expansion of the supply succeeds, it can create a more stable compliance environment. If, however, the supply grows slowly, airlines will find it harder to plan the cost of their CORSIA obligations, which can put pressure on the industry as a whole.

Not every sustainability cost means an automatic price increase

Ticket prices are driven by many factors, so it would not be correct to state that the supply shortage of CORSIA quotas directly and alone makes the vacation or business trip of Hungarian travelers more expensive. Airline pricing is shaped by demand, competition, fuel price, currency exchange rates, airport fees, aircraft utilization, and seasonal capacity together. CORSIA is rather another element that appears in the overall cost picture of international flights.

At the same time, the topic is timely because during the summer peak season, Hungarian travelers also encounter the hidden costs of flying more and more often: baggage fees, seat selection, transfer risks, airport congestion, or dynamic pricing. Sustainability compliance is not the same kind of consumer fee, but it is part of the broader picture in which airlines must simultaneously ensure competitive prices, reliable operation, and regulatory compliance.

What should the traveler look for when booking?

The CORSIA news does not require immediate passenger-side action, but a few sensible points are worth incorporating into planning. First, for long-haul trips, do not look only at the base ticket price, but at the total trip cost: baggage, transfer time, separate ticket connections, airport transfer, and possible overnight stays count together. Second, regarding sustainability claims, look for specifics: does the airline use only general marketing language, or does it name the program, the methodology, and the verification?

Third, maintain an appropriate buffer for transfer routes. Sustainability regulation is not about daily flight operation, but in international aviation, several pressures are present simultaneously: airport capacity, air traffic control, geopolitical risks, fuel prices, and regulatory reforms. Checking Budapest airport flight information and Vienna airport flight information before departure remains a fundamental step, especially if the journey continues on a separate ticket.

What does all this mean for the tourism market?

For tourism, the sustainability transition of aviation is a dual challenge. On one hand, without long-haul air connections, many destinations are difficult to reach, and a significant part of inbound tourism still relies on flying. On the other hand, consumers, regulators, and corporate travel organizers ask more and more about emissions, transparency, and climate impact. The IATA initiative aimed at expanding the CORSIA supply in this environment indicates that aviation manages the climate issue not only as a technological but also as a market and governmental cooperation.

From Hungary's perspective, this becomes particularly important if long-haul flights, Central European transfer options, and inbound tourism continue to strengthen in the coming years. The sustainability costs of airlines are not isolated accounting items: they can influence which markets it is worth opening capacity in, which flights remain seasonal, and which business models prove sustainable.

A cautious but important signal for the coming years

The IATA announcement is not a spectacular passenger-side change, but an industry warning: to comply with the carbon market of international aviation, it is not enough to create the rules, the supply of actually usable, authentic emission units must also be built. The goal of 225-250 million CORSIA units, the spring 2027 time horizon, and the current supply gap together show that the next year and a half will be important for the practical operation of the system.

Travelers should derive context, not panic, from this now. The price and availability of flying in the coming years will depend not only on demand and fuel, but increasingly on sustainability compliance. The good news is that the topic is no longer an abstract promise: governments, airlines, carbon market participants, and industry organizations are trying to manage a concrete supply problem. The question is that whether this happens quickly enough for CORSIA to truly provide a stable, authentic, and predictable framework for the climate obligations of international aviation.

Sources: IATA communication on the expansion of the CORSIA EEU supply alliance, IETA joining communication, IATA CORSIA background material, ICAO/IATA CORSIA EEU Supply Project professional material.