º£½ÇÊÓƵ

Aviation operators are contending with mounting, simultaneous pressures: rising global demand, essential growth activities, decarbonisation expectations and day-to-day operational realities. How can near and long-term capacity growth be considered alongside decarbonisation, resilience and circularity objectives?

Passenger volumes are increasing, and so are expectations for decarbonisation. Aviation remains a sector with , which sharpens scrutiny from passengers, investors, operators and regulators. This raises a central question: how to build a robust business case for sustainability that aligns long term investment decisions with these stakeholder pressures?

For airport executives and financial decision makers, the debate has long moved away from whether to act on decarbonisation, but rather how to phase and fund action alongside other critical development priorities (capacity expansion, digital transformation, commercial development) while safeguarding continuity and reliability of operations.

And while airports directly control only a fraction of sector-wide emissions – with aircraft operations accounting for around – holistic airport strategies must nevertheless safeguard for the fuels, technologies and systems that will decarbonise flight itself.

Airports operate as highly complex, interdependent systems that require integrated solutions. This perspective examines practical approaches for aligning near and long-term capacity growth with decarbonisation, resilience and circularity objectives.

1: Sustainability is now a licence to operate

A fundamental tension remains between aviation growth and the need to decarbonise. Air travel demand continues to grow: the Airports Council International (ACI) predicts that global passenger traffic is forecast to . Capacity needs to scale up, rapidly, to meet this demand.

But there is a critical tension when considering how to deliver this growth: decarbonisation, energy and efficiency targets now provide a licence to operate and are part of financial planning and day-to-day operations.

Operating in this way is largely priced in as a necessity, not a luxury. Regulatory pressures (global and local, such as in the EU) mean that sustainability-driven constraints and frameworks are already in place

Industry bodies have moved from pledges to hard expectations (such as International Air Transport Association [IATA] member airlines committing to achieving . Pathways to achieve net zero almost always form part of airport submissions for approval for expansion plans.

In all industries, access to capital is increasingly conditional based on sustainability performance and sustainability credentials have become a core market differentiator, influencing consumer choice. Passengers have growing expectations for credible action. Realistic decarbonisation activities and pathways reduce exposure to carbon costs, strengthen access to capital and meet rising passenger expectations.

All this adds up to one inescapable conclusion: sustainability requirements are now central to how airports run.

2: Circular, low carbon by default

Major terminal, runway and landside developments lock in material and carbon decisions for decades, making early whole life design choices from the outset especially critical in aviation – where infrastructure lifespans, safety requirements and operational continuity intensify that long term impact.

Early design decisions are key: disassembly from the start, modular construction, material optimisation, low carbon alternatives and reuse of existing assets or materials. An approach that considers the whole-life of materials offers reduced demand for new raw materials and higher recycling rates at end of life. Circular economy principles offer a pathway to reduce whole life emissions and material intensity across expanding aviation estates.

Circular approaches are now established in aviation estates, indicating how thoughtful, whole-life planning can deliver both sustainability upsides and client benefits. An instructive example emerges from Heathrow airport’s Kilo Taxiway, where ‘new’ pier-served aircraft stands were delivered by re-using remote parking stands – maximising material reuse on site and reducing waste, carbon footprint and costs.

Across the whole project, a total of 15,000m3 of the apron concrete was processed and reused on site along with 87% of excavated material. Most of the remaining materials were processed offsite and returned to the airport for re-use. º£½ÇÊÓƵ worked with design engineers Webb Yates Engineers (WYE), to deliver specialist category three (Cat. III) checking services and consultancy.

An approach that is circular by default can reduce capex spend through material reuse and longer asset life, provide desired embodied and operational carbon cuts and provide ready-made solutions for a sector in the midst of a decarbonisation and sustainability crunch. For example, the construction strategy of offsite construction and relocation at LAX Midfield Satellite Concourse South supported circularity and reuse from the outset.

3: The central role of resilience

Continued operation across the next five, 10, 20 and 50 years will depend on a robust resilience strategy – both resilient infrastructure and an airport’s ability to manage change risks.

Aviation structure and operations face a wide range of climate risks, changes and challenges. Climate impacts are already being felt across airports: extreme heat, flooding, storms and wildfires are clear, tangible risks, with operational (heatwaves melting the tarmac on runways, as seen at Dubai International Airport in 2024, storms) and financial (cost of capital, insurance exposure, asset depreciation) implications.

: if resilience is not built in against climate risks (both transitional and physical), then airports open themselves up to:

• Chronic operational disruption
• Reduced reliability
• Costly downtime
• Asset damage
• Rising insurance premiums.

Physical risks – especially climate induced risks – must be integrated into broader business continuity and resilience planning, so that operations can continue.

Ensuring the resilience of critical systems – particularly electrical infrastructure – that will withstand the shocks caused by extreme weather or other major unplanned failures requires clear-headed design strategies. This can include a focus on eliminating single points of failure, strengthening grid resilience or generating on-site energy.

Knowing that the infrastructure, systems and processes of the airport are resilient, robust and future-proofed will give a greater level of confidence to airport owners and operations. Across the sector, best practice is to build climate resilience into expansion plans and masterplanning of new airports using data driven design of the airport’s requirements in the future, whether operations based or as a climate response.

For example, airports must plan proactively for emerging aviation technologies (Sustainable Aviation Fuel [SAF], electric aviation and hydrogen aircraft) by building infrastructure and systems that are resilient, flexible and capable of adapting to evolving spatial, energy and operational demands. While airports do not influence aircraft emissions directly, decisions made today must ensure readiness for a future mix of technologies.

4: Think like a campus: integrated net zero energy

How airports source their energy is a critical area for two reasons:

• A resilient energy system that can safeguard against shocks is key for continued, reliable operation
• Energy sourcing and use is central to sustainability and net-zero strategies.

Airports increasingly function as mini-campuses or cities, with multiple systems that must operate in harmony. Interdependent systems and high energy demand create both risks and opportunities for innovative energy planning. Innovative developers and planners can take the opportunity to rethink how energy is provided.

For leadership teams shaping long-term strategy, energy is becoming a core lever for delivering resilience – moving it from a cost and a risk, towards a strategic asset that underpins net zero targets, supports emerging technologies and keeps operations running.

Current strategies being evaluated across the sector include onsite generation and microgrids, district heating/cooling and hydrogen readiness. On-site low and zero carbon technologies like microgrids develop and improve resilience, drive decarbonisation and can provide services to the broader community within which the airport sits (for example, within airport cities).

Preparing for future aircraft technologies will also reshape airport energy strategies. Electric aviation will increase peak electrical loads, while SAF and hydrogen introduces new storage, quality and safety requirements. A resilient, flexible energy system is essential to accommodate how airports and aircraft operate in the future.

To navigate the complexity of emerging energy systems in airport terminals, operators can adopt an integrated, campus‑scale energy approach. Rather than viewing microgrids, onsite generation, district energy systems or hydrogen readiness as isolated options, they should be combined into a coherent, whole‑estate energy masterplan.

Navigating the challenge

Airports face rising demand mixed with strict decarbonisation pressures, requiring them to balance growth with funded and phased operational change. The key question is – how to navigate this challenge? How to turn established and future decarbonisation commitments into a practical, investable pathway?

Progress is delivered through an appropriately sequenced programme of action that will have the most impact/rate of return, understanding what the most material risks in the immediate future are and how climate risk, energy resilience and circularity is integrated into a masterplan.

It requires a holistic understanding of the critical decisions that are explicitly linked to decarbonisation, resilience and circularity targets – and the benefits that integrating these commitments and opportunities will bring to operators. These benefits include:

• Competing more effectively
• Delivering long-term revenue growth
• Reducing operational energy costs through better performing buildings
• Delivering resilient and lower cost sustainable onsite energy generation.

When framed in this way, sustainable airports look less like meeting external targets and more like good business sense.

Significant progress has been made on sustainability in aviation, but the scale of change still needs greater impetus. It demands a coordinated, wide scale programme spanning strategy, design, delivery and operations. º£½ÇÊÓƵ’s role is to support airport leaders, using cross‑sector campus experience, aviation‑specific delivery expertise and multi-disciplinary services to design the sustainable airport of the future.

Get in touch with Karl Lyndon, global aviation sector leader at º£½ÇÊÓƵ, to continue the conversation.