Airport public-private partnerships are unusual among infrastructure concessions because a meaningful share of revenue often comes from sources that have nothing to do with airplanes — retail, parking, car rental concessions, and property development. Modelling that revenue stream well separates a defensible bid from an optimistic one.
Two Very Different Revenue Streams
Aeronautical revenue — landing fees, passenger service charges — is typically regulated or contractually set, and scales relatively predictably with passenger traffic forecasts. Non-aeronautical revenue is commercially driven: retail and food and beverage spend per passenger, parking utilization and pricing, and property or cargo development on airport land. At many airports, non-aeronautical revenue represents 40-60% of total revenue, and it carries a very different risk profile than the regulated aeronautical side.
Why Traffic Forecasts Aren’t Enough
A passenger traffic forecast tells you how many people are coming through the terminal — it doesn’t tell you how much they’ll spend at the shops, or whether a competing retail concept nearby erodes concession revenue over the concession life. Non-aeronautical modelling typically requires its own spend-per-passenger assumptions by category, informed by comparable airport benchmarking, and its own sensitivity analysis independent of the traffic assumptions.
Capital Investment Trade-offs
Because commercial revenue is directly influenced by terminal design and retail footprint, sponsors face a genuine trade-off: additional capex on retail space or a redesigned passenger flow can increase commercial revenue, but only if the incremental revenue justifies the incremental capital cost and construction risk — a decision that needs its own return-on-investment analysis layered into the broader project model.
The Practical Takeaway
Airport PPP models that treat non-aeronautical revenue as a simple multiple of passenger traffic are missing the real commercial dynamics that drive it. A sponsor bidding on the strength of an aggressive commercial revenue assumption, without benchmarking it against comparable airports’ actual performance, is taking on risk the model doesn’t visibly show.
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