From demand to investment: the value of connected airport planning

Why connecting demand, capacity, infrastructure and strategy can make a real difference in airport development

In airport planning, almost no decision ends where it begins.

A seemingly minor assumption in a traffic forecast can, several steps later, affect the number of aircraft stands required, terminal size, runway capacity, the phasing of an expansion or the CAPEX needed.

And between those two ends of the process, many decisions need to remain connected: what is driving traffic growth, how demand is distributed throughout the year and across the day, which airlines are operating it, with what aircraft, what share of passengers are connecting, and what operating model the airport ultimately wants to develop.

For that reason, the quality of a Master Plan does not depend only on whether each individual analysis has been properly carried out. It also depends on whether demand assumptions, Design Days, capacity assessments and infrastructure solutions follow the same logic and remain aligned with the operator’s objectives.

In our experience, a significant part of the quality — and efficiency — of airport planning lies precisely in that connection.

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From forecast to infrastructure

A traffic forecast, on its own, does not size an airport.

Two airports handling ten million passengers per year can have completely different infrastructure requirements. Peak-hour concentration, aircraft mix, the balance between domestic and international traffic, O&D and connecting passengers, network structure or airline strategy can materially change the outcome.

That is why one of the most important steps is translating the forecast correctly into Design Days and operational profiles that genuinely represent future demand.

This is where traffic really begins to become infrastructure.

Those profiles are what allow us to assess aircraft stands, terminal facilities, baggage systems, border control, access, apron requirements, or the capacity of the runway and taxiway system.

At Leadin Aviation, we connect those stages directly: Market Analysis, Traffic Forecasting, Design Days and Capacity Planning with Master Planning, Functional & Concept Design and CAPEX.

This means that those planning the infrastructure understand the reasoning behind the demand, while those developing the forecast understand the consequences that an assumption may have several steps later.

And this connection is far from a minor issue.

In our work reviewing Master Plans, we regularly come across capacity results or investment proposals that are difficult to reconcile with the demand they are intended to serve. In many cases, the problem is not a specific calculation, but a loss of coherence between three critical steps: the traffic forecast, its translation into a Design Day Flight Schedule (DDFS), and the infrastructure solution eventually proposed.

A relatively small distortion between these stages can ultimately translate into very significant differences in sizing and, consequently, in CAPEX.

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A Master Plan never develops in a completely straight line

Conditions change during a project.

An airline may modify its strategy. Connecting traffic may increase. The fleet mix may change. A new operator may enter the market. The client may decide to prioritise contact stands, postpone an expansion or explore a lower-CAPEX alternative.

And when this happens, changing the drawing is not enough.

You need to understand which assumption has changed and what consequences that change has across the rest of the system.

A similar annual traffic volume, for example, can result in very different requirements if peak-hour concentration or average aircraft size changes. A stronger connecting strategy may affect not only certain terminal processes, but also flight distribution, connection banks and stand requirements.

When demand, capacity and infrastructure have been developed as part of the same logic, these iterations become much easier to manage.

There is no need to reconstruct the reasoning behind the project. It becomes possible to identify quickly what has changed, where it has an impact and what needs to be revisited.

That provides something particularly valuable in airport planning: control.

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Planning the airport the operator actually wants to develop

Infrastructure does not respond only to demand. It also responds to strategy.

One airport may prioritise passenger experience and contact stands; another may pursue a highly CAPEX-efficient solution. One may have a strong connecting component, another may be predominantly O&D, while another may be heavily constrained by physical, concession-related or financial limitations.

The forecast may look similar. The airport that needs to be planned may be completely different.

Before defining a solution, it is therefore essential to understand what kind of airport the operator wants to develop, how it wants to operate it, and what its real priorities are.

From there, the challenge is to find the right balance between capacity, operational efficiency, passenger experience, commercial development, flexibility and CAPEX.

Oversizing infrastructure is not good airport planning. But neither is designing it so tightly that it loses the flexibility needed to accommodate future change.

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From market to CAPEX: one single decision chain

This is probably where one of the main advantages of integrating the entire process becomes most apparent.

An investment decision should be explainable by working backwards through the project.

• Why do we need this infrastructure? - Because a capacity shortfall appears at a certain horizon.

• Why does that shortfall appear? - Because the Design Day places a certain level of demand on the system.

• And why does the Design Day have that profile? - Because the expected evolution of the market leads to a particular combination of passengers, operations, airlines and fleet.

That link between market, forecast, operations, capacity, infrastructure and CAPEX allows us to continuously check that the proposed solutions remain consistent with both the underlying assumptions and the operator’s objectives.

It also allows alternatives to be tested in a much more meaningful way.

Can an investment be postponed? Is there an operational solution before building new infrastructure? What happens if the fleet mix changes? What if growth materialises differently from what was expected? Can the infrastructure be developed in another way to reduce CAPEX without compromising operations?

These are often the questions that determine whether a business plan can ultimately be viable and attractive for an airport operator.

And this is also where we see another recurring issue in the industry.

Traffic forecasting and Master Planning are often procured separately, sometimes from providers with very different profiles. One team delivers the forecasts and another receives those outputs later to translate them into planning and infrastructure.

That model can work, but it requires very strong coordination. Without that continuity, it is relatively easy to lose part of the original forecasting logic, interpret assumptions differently, or develop a DDFS that does not properly reflect how traffic was expected to evolve.

From that point onwards, any deviation tends to amplify.

Capacity may become over- or undersized, infrastructure solutions may respond to demand that does not properly represent the future operation, and the resulting CAPEX can move significantly away from what the airport actually requires.

Our ability to work in technical depth across both forecasting and DDFS development, as well as capacity planning and airport planning, allows us to control precisely those transition points.

It does not mean that there is only one possible solution. It means that each solution can be continuously tested against the demand, the operation and the strategy that justify it.

The objective is simple: to optimise the infrastructure and ensure that the business plan built around it is coherent, defensible and realistic.

This same logic also opens the door to a more dynamic way of approaching Master Planning: plans that are able to evolve together with demand, operations and airport strategy, without having to rebuild the entire process every time a relevant variable changes.

It is an approach we strongly believe in, and one we will explore further in our next article.

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Integration means coherence

At Leadin Aviation, we have built our capabilities around this way of understanding airport planning.

Being able to work in technical depth at each stage while maintaining a complete view of the project allows us to preserve the logic connecting decisions from the earliest assumptions through to investment.

It is not simply about delivering more parts of a project with the same team.

It is about understanding what effect a traffic assumption may have on an aircraft stand, what impact an operational decision may have on a terminal, or what planning rationale lies behind a specific CAPEX requirement.

And when one of those variables changes, knowing exactly where to go back.

Because airport planning is not about producing a collection of technically correct studies.

It is about building one coherent development logic — from market to investment — and keeping it aligned with the operator’s objectives throughout the entire process.

Eduardo Coll Hernandez

CEO

Leadin Aviation Consulting