Trinity Airways Completes Carbon Credit Retirement for CORSIA Compliance
Airlines operating international routes must offset a portion of their carbon emissions under global aviation rules. For South Korean carriers, that obligation is no longer theoretical. Trinity Airways recently became the first Korean airline to announce it has bought and committed to retire carbon credits under the International Civil Aviation Organization's offsetting scheme, and the move signals a wider shift in how the country's aviation sector is preparing for compliance deadlines now less than three years away.
The announcement centres on a deal with NH Investment & Securities covering 20,000 tons of eligible carbon credits. Trinity Airways has signed a retirement contract for those credits and plans further purchases before the end of this year. The airline aims to secure over 10% of the total volume it will need by January 2028, when the first batch of offsets must be formally retired under CORSIA rules.
CORSIA stands for the Carbon Offsetting and Reduction Scheme for International Aviation. It requires participating airlines to offset growth in CO2 emissions from international flights above a baseline calculated from 2019 and 2020 levels. The scheme's first compliance phase runs from 2024 to 2026. Airlines must retire eligible carbon credits covering those three years of emissions by 31 January 2028.
Retirement means permanently removing credits from the registry so they cannot be sold or claimed again. Purchasing credits alone does not satisfy the obligation. The credits must be retired in the name of the airline and reported to ICAO to count toward compliance. Consequently, timing and contract structure matter as much as price.
Why South Korean airlines are moving early
South Korea has 11 airlines with obligations under CORSIA. Their combined annual demand is estimated at more than three million carbon credits, with Korean Air and Asiana Airlines accounting for roughly 80% of that total. Trinity Airways represents a much smaller share, but its public commitment reflects broader market pressures affecting the entire sector.
Supply of CORSIA-eligible credits remains limited. Not all carbon offset projects meet ICAO's eligibility criteria, and those that do are facing rising demand from airlines worldwide. In addition, prices have been moving. Early purchasing can lock in costs and reduce exposure to future price increases, particularly as the 2028 deadline approaches and competition for credits intensifies.
A July 2024 report from S&P Global noted that South Korean carriers were already using financial intermediaries to reduce counterparty risk when sourcing credits. Price was identified as the main purchasing criterion. However, the same report also flagged caution among Korean airlines due to geopolitical tensions in the Middle East, with many carriers expected to delay detailed procurement discussions until later in the year and some transactions pushed into 2027.
Trinity Airways' announcement therefore stands out. Instead of waiting, the airline has moved to secure credits and formalise a retirement contract well ahead of the compliance window. This suggests a strategic decision to manage regulatory risk early, even if it means committing capital before market conditions fully stabilise.
How the ICAO offsetting scheme works in practice
CORSIA applies only to international flights. Domestic aviation emissions fall outside its scope. The scheme calculates an airline's offsetting requirement based on its share of growth in total international aviation emissions above the 2019-2020 baseline. Airlines in participating countries must monitor, report, and verify their emissions annually, then purchase and retire enough eligible carbon credits to cover their share of the growth.
Eligible credits must come from projects approved under ICAO's Technical Advisory Body criteria. These include certain renewable energy, forestry, and methane capture projects, but not all offset types qualify. For example, credits from projects registered after 2016 under the Verified Carbon Standard or Gold Standard may be eligible, subject to specific conditions. Airlines cannot use credits from schemes that ICAO has not recognised.
The first compliance phase covers 2024, 2025, and 2026. Airlines have until 31 January 2028 to retire the required volume of credits for those years. After that, a second phase will cover 2027 to 2029, with a retirement deadline of 31 January 2031. Participation is currently voluntary for some countries, but becomes mandatory for most from 2027 onward. South Korea is among the early participants.
Retirement happens through approved carbon registries. Once an airline retires credits, they are marked as cancelled and cannot re-enter the market. The airline then reports the retirement to its national regulator, which in turn submits data to ICAO. Failure to retire sufficient credits can result in penalties, including potential restrictions on route approvals or operating certificates in other jurisdictions.
What the Trinity Airways deal involves
Trinity Airways signed a memorandum of understanding with NH Investment & Securities covering cooperation on CORSIA compliance and emissions trading. The airline described it as the first such agreement between a Korean carrier and a financial firm. Under the arrangement, NH Investment & Securities will help source, structure, and manage the retirement process for eligible carbon credits.
As part of the initial commitment, Trinity Airways purchased 20,000 tons of CORSIA-eligible credits and signed a contract to retire them. The airline also confirmed plans to acquire additional credits by the end of 2026, targeting a total volume exceeding 10% of its estimated requirement for the 2024-2026 compliance period. The company framed the move as a proactive response to market uncertainty and regulatory timelines.
Financial intermediaries like NH Investment & Securities offer several advantages for airlines entering the carbon market. They can aggregate demand across multiple buyers, reducing transaction costs. They also conduct due diligence on credit quality, ensuring that purchased offsets meet ICAO eligibility criteria. In addition, they manage counterparty risk by standing between the airline and the project developer or broker.
This model may become more common as smaller airlines face the administrative burden of navigating CORSIA compliance without dedicated sustainability teams. Larger carriers such as Korean Air and Asiana Airlines have more resources to manage procurement directly, but mid-tier operators like Trinity Airways may find intermediary partnerships more efficient.
Market conditions and price dynamics
The market for CORSIA-eligible credits is still developing. Prices vary depending on project type, vintage, and certification standard. Forestry credits, for instance, often trade at different prices than renewable energy credits due to differences in permanence risk and co-benefits. Aviation-quality credits generally command a premium over those used for voluntary offsetting because they must meet stricter criteria.
Several factors are driving prices upward. Global demand for carbon offsets is rising across multiple sectors, not just aviation. Meanwhile, supply remains constrained by the time required to develop, certify, and issue new credits. Projects can take years to move from inception to the point where credits are available for purchase. Regulatory changes in host countries can also affect supply, particularly if governments tighten rules around export of domestically generated credits.
For South Korean airlines, there is an additional layer of complexity. The country's emissions trading scheme, known as K-ETS, governs domestic emissions but does not directly cover international aviation. However, Korean airlines must navigate both domestic carbon regulations and international CORSIA obligations, which can create overlapping reporting requirements and strategic trade-offs around where to deploy capital.
Early purchasing offers some protection against future price increases. However, it also exposes buyers to the risk that prices could fall if supply increases faster than expected or if demand softens due to economic downturns or changes in ICAO policy. Trinity Airways appears to have accepted this trade-off in exchange for certainty around compliance and cost.
Key details for businesses tracking aviation carbon markets
- Trinity Airways purchased 20,000 tons of CORSIA-eligible carbon credits and signed a retirement contract with NH Investment & Securities, the first such public commitment by a Korean airline.
- The carrier plans to acquire additional credits by the end of 2026, aiming to exceed 10% of its total retirement requirement for the 2024-2026 compliance period.
- CORSIA's first compliance phase covers emissions from 2024 to 2026, with a retirement deadline of 31 January 2028 for all participating airlines.
- South Korea has 11 airlines with CORSIA obligations, and their combined annual demand is estimated at over three million carbon credits, with Korean Air and Asiana Airlines accounting for approximately 80% of that total.
- South Korean carriers are using financial intermediaries to manage counterparty risk and ensure credit eligibility, with price identified as the main factor driving purchasing decisions.
- Geopolitical uncertainty in the Middle East has contributed to caution among some Korean airlines, with many expected to delay major procurement decisions until later in 2024 or into 2027.
Implications for procurement and supply chain strategy
Airlines are not the only businesses affected by CORSIA. Suppliers, fuel providers, and service contractors in the aviation sector face indirect pressure as carriers work to manage emissions and offset obligations. For example, airlines may begin to favour suppliers with lower carbon intensity in their own operations, particularly as Scope 3 emissions reporting becomes more common.
Carbon credit procurement also has commercial implications beyond compliance. Airlines competing for corporate travel contracts or public sector tenders may find that demonstrated progress on emissions reduction and offsetting becomes a differentiator. Procurement frameworks increasingly include environmental criteria, and early movers in CORSIA compliance may gain advantages in bid evaluations.
Supply chain partners should expect more detailed requests for emissions data from airline clients. This includes fuel suppliers, ground handling companies, catering providers, and maintenance contractors. Airlines building their emissions inventories need granular data from across their value chain, and those unable to provide it may face exclusion from preferred supplier lists.
There is also a reputational dimension. Airlines that secure and retire credits early can communicate progress to passengers and stakeholders. Conversely, those that leave compliance to the last moment risk negative attention if they struggle to source sufficient credits or face price spikes. For businesses connected to the aviation sector, understanding these dynamics helps anticipate client requirements and align offerings accordingly.
What businesses should consider now
For companies in the aviation supply chain, the Trinity Airways announcement serves as a signal that CORSIA compliance is moving from planning to execution. Suppliers should prepare for increased scrutiny of their own emissions profiles and consider how they can support airline clients in meeting their obligations.
Businesses involved in carbon markets, whether as project developers, brokers, or registry operators, should note the growing role of financial intermediaries in aviation carbon procurement. Partnerships between airlines and investment firms may create new channels for credit distribution and open opportunities for structured products tailored to CORSIA requirements.
Airlines themselves face decisions about timing, volume, and sourcing strategy. Buying early reduces regulatory risk but ties up capital and exposes buyers to price risk. Waiting may allow for better price discovery but increases the chance of supply shortages or price spikes as the 2028 deadline nears. Each carrier will need to balance these factors based on its financial position, risk tolerance, and emissions profile.
Smaller airlines may benefit from collaborative procurement or industry consortia that aggregate demand and negotiate volume discounts. Financial intermediaries can facilitate these arrangements, but airlines will need to conduct due diligence on credit quality and ensure that retirement contracts are structured to meet ICAO reporting requirements.
Businesses outside aviation but with carbon offset requirements under other schemes should also monitor CORSIA developments. The market for high-quality, internationally recognised carbon credits is increasingly integrated. Pricing and availability in the aviation market can influence conditions in voluntary and compliance markets elsewhere. Consequently, movements in CORSIA procurement can serve as leading indicators for broader carbon market trends.
Where to find further information
The International Civil Aviation Organization publishes detailed guidance on CORSIA, including lists of eligible carbon offset programmes and reporting requirements. Airlines and suppliers can access these resources through the ICAO CORSIA webpage, which includes technical manuals, eligibility criteria, and updates on policy developments.
The UK Department for Energy Security and Net Zero provides guidance on emissions trading and aviation, including how UK-based airlines should approach CORSIA compliance. This is particularly relevant for businesses operating across multiple jurisdictions or supplying UK carriers.
For businesses seeking to understand carbon credit quality and certification standards, the International Emissions Trading Association offers resources on market structure, trading practices, and regulatory frameworks. Their publications cover both compliance and voluntary markets and include case studies from the aviation sector.
Companies looking to develop internal carbon management capabilities may find value in training programmes focused on emissions reporting and offset procurement, which can help build the expertise needed to navigate CORSIA and related carbon regulations.
Finally, businesses should monitor announcements from South Korean regulators and industry bodies, as these will shape how the country's airlines implement CORSIA compliance and may influence procurement strategies across the sector. Staying informed on both international and domestic policy developments is essential for companies connected to Korean aviation markets.