Airports Council International (ACI) World has called on governments to begin planning airport capacity immediately, arguing that decisions made — or deferred — today will determine whether aviation infrastructure can absorb future traffic growth.

The appeal, reported by Air Cargo Week, places ACI World, the global body representing the world's airports, in direct dialogue with national governments over one of the industry's most consequential and least reversible questions: where and when to build terminal and runway capacity.

The urgency in ACI World's messaging rests on the nature of airport infrastructure itself. Runways, terminals, taxiway systems and cargo processing facilities take years to consent, finance and construct. Traffic demand, by contrast, recovers and grows on much shorter cycles. An airport that waits until passenger and freight volumes press against its physical limits has, in practical terms, already waited too long.

ACI World's call is directed at the governmental level for a straightforward reason: in most jurisdictions, the binding constraints on airport expansion are not engineering or financing but political. Planning consent, land use approval, environmental review and inter-ministerial coordination all sit with public authorities. An airports trade body can build the case for capacity; only governments can unlock it.

The cargo dimension gives the appeal particular weight. Air cargo has been among the fastest-recovering segments of the industry since the pandemic, and freighter operations, express networks and belly capacity all compete for the same scarce airport assets: stands, slots, freight terminal space and night-hour access. Where passenger traffic can, to a degree, be managed through scheduling and pricing, cargo flows relocate quickly to airports that can process them efficiently — and they do not easily return.

ACI World's position also carries an implicit warning about the cost of inaction. Congested airports push delays into airline networks, raise unit costs for carriers and shippers, and cap the route development that airports themselves rely on for commercial revenue. Capacity shortfalls do not merely inconvenience travellers; they constrain trade volumes and the connectivity that governments cite when promoting national economic strategies.

The trade body's framing — that planning must happen "now" — acknowledges that airport projects carry long lead times by design. Environmental assessment, community consultation, design competition, construction and commissioning can each consume years. A government that begins evaluating capacity needs only when congestion becomes visible is committing its national network to a decade of operating at or beyond design limits.

For airlines, the question of airport capacity translates directly into fleet and network planning. Aircraft orders placed today are premised on slots, gates and turnaround capacity existing at the destinations those aircraft are intended to serve. Where airport capacity fails to keep pace with fleet growth, the mismatch shows up as slot scarcity, schedule fragmentation and aircraft parked at peak hours — assets depreciating without flying.

For cargo operators and integrators, the calculus is similar but sharper. Express hubs in particular depend on concentrated night operations and precise ground-handling windows. An airport that cannot expand its freight footprint forces its cargo customers to restructure networks around other gateways, often in other countries.

ACI World's public urging is, in effect, an attempt to move the capacity debate upstream — from individual airport master plans to national infrastructure policy. Airports can propose; transport ministries, finance ministries and planning authorities dispose. The trade body's argument is that the disposing should begin before the shortage is upon the system.

What remains to be seen is whether governments treat airport capacity as strategic infrastructure worthy of early planning, or continue to address it project by project, airport by airport, once congestion forces the issue. ACI World has made its position clear: the planning window is open now, and it will not stay open indefinitely.