Sustainability and infrastructure planning: Why 2026 is the year the numbers catch up

Most airports can point to a net zero target and a master plan. Far fewer can say, with confidence, what either one will cost, or whether the assumptions behind it still hold. That gap is no longer a technical footnote. It has become a capital allocation problem, and it is landing squarely on the desks of CEOs and boards rather than sustainability or projects teams. Two separate pressures are converging at once. On the sustainability side, pledges made back in 2019 and 2020 are now coming due, and the easy part is already behind most airports. Scope 1 and 2 emissions, the ones an airport directly controls, are the more manageable half of the equation. Scope 3, covering airlines, ground handlers, concessionaires and surface transport, is a different problem entirely: airports have almost no direct authority here, only influence, and that influence is proving thinner than public commitments suggested. On the infrastructure side, the twenty-year master plan is under similar strain. Demand forecasts that once felt stable are now vulnerable to climate policy shifts, fuel prices, and changing traveller behaviour, all of which can move faster than a runway or terminal can be built. Add to that the reality of building major infrastructure while an airport keeps operating at full capacity, and the room for error narrows considerably. Real-world examples already illustrate how airports are approaching these trade-offs. Heathrow Airport has embedded carbon reduction into its long-term capital programme by integrating sustainability requirements into major infrastructure projects, while Cochin International Airport has demonstrated the value of phased investment, expanding from a 12 MW solar plant in 2015 to more than 50 MW today and generating surplus renewable energy for the state grid. On Scope 3 emissions, San Francisco International Airport's Sustainable Aviation Fuel (SAF) Stakeholder Working Group shows what meaningful collaboration looks like when an airport cannot mandate change but can Denver International Airport's Great Hall renovation tells the harder story. A 1.8 billion dollar, 34-year partnership to renovate a live terminal ran into concrete defects and mounting change orders within a year, eventually forcing Denver to terminate the contract, absorb a costly unwind, and rebuild under direct owner control. The project ultimately succeeded, but only after the airport learned firsthand how much design certainly needs to be locked down before signing a fixed-price contract on a live site. These are the exact trade-offs the IAS 2026 Roundtables are built around: funding decarbonisation in full versus phasing it, pushing on Scope 3 versus focusing on what's directly controllable, and committing to infrastructure now versus waiting for more certainty. None of these have a universal answer. They depend on funding structure, regulatory context and risk appetite, which is exactly why they are better worked through with peers than resolved alone. Delegates joining the roundtables in Rome this November will leave with a realistic cost baseline for decarbonisation, a clearer read on where Scope 3 influence actually ends, hard lessons from infrastructure delivery gone wrong, and a stronger framework for making capital decisions when the future they're built for is far from settled. Register your interest for IAS 2026, 11 to 12 November, Hilton Rome Airport, Italy, by clicking here.