How transport infrastructure works: owners, operators and who pays
The four kinds of asset, the ways they are owned, how each earns its money, and the measures owners and regulators watch.
Industry brief, with a one-minute summary: Transport infrastructureKey takeaways
- An airport, a port, a toll road or a railway is a long-lived asset that is very expensive to build and fairly cheap to run, and often has no close rival.
- Regulated asset base (RAB): the value a regulator recognises for the assets, on which it allows a return.
- Allowed return or WACC: the yearly return on the asset base the regulator allows, set close to the owner's cost of capital.
Key idea
An airport, a port, a toll road or a railway is a long-lived asset that is very expensive to build and fairly cheap to run, and often has no close rival. So the question in almost every case is not "how do we beat competitors" but "what is the owner allowed to charge, by whom, and who carries the risk if traffic falls?" The answer is written in a regulator's decision or a concession contract, and it sets the profit more than daily management does.
Transport infrastructure is the fixed part of transport: the runways and terminals, the quays and cranes, the roads and the rail tracks. Airlines, shipping lines, truck firms and train companies use it and pay for it. The Industries library has separate modules for airlines and for logistics and shipping; this one is about the owners of the assets those businesses use. Because the assets last 30 to 100 years and cost billions, they are usually owned by governments, by private investors under long contracts called concessions, or by regulated private companies whose prices are capped.
| Model | Who owns the asset | Who runs it and takes the money | Examples |
|---|---|---|---|
| State agency | Government | A public body, funded by fees and the budget | US airports (every major one is owned by a government body), Indian Railways |
| State-owned company | Government, as shareholder | A company that must earn a return | Dubai Airports, DP World and AD Ports Group (Gulf), Aena (51 percent state owned) |
| Concession or public-private partnership (PPP) | Government keeps ownership | A private company builds or runs it for 15 to 99 years, then hands it back | French motorways, Indian toll roads, Mexican airports, Kansai airports in Japan |
| Landlord port | Port authority owns land and quays | Private terminal operators lease berths, buy cranes and handle the cargo | Rotterdam, Antwerp, New York, Singapore since 1997 |
| Private owner | Private investors, outright | The owner; where it has market power, a regulator caps its charges | Heathrow (charges capped), Gatwick, most UK ports |
So-what
Before any number, find out which model the client is in. It decides who sets the price, who carries the traffic risk and when the asset has to be handed back.
- Transport infrastructure revenue
- Key: AirportsAeronautical: landing, parking and per-passenger charges paid by airlines, often capped by a regulator. Commercial: shops, food, car parks, property, advertising
- Seaports and terminalsPort authority: land leases and port dues. Terminal operator: a fee for each container lifted, plus storage and other services
- Toll roadsTolls per vehicle or per kilometre, usually rising each year by a formula linked to inflation
- Rail and urban transitFares and freight rates; track access charges paid by train operators; government payments; property built on or near stations
Each asset earns from the users that move through it, and most also earn from property and shops that exist because of that traffic.
Bar chart: Aena revenue by type, 2025 (EUR million). Values in EUR million. Aeronautical (airline and passenger charges): 3,346.8; Commercial (shops, food, car parks, advertising): 1,975.1; Other (property, international airports, construction accounting): 1,057.3.
So-what
Spain's airport group, which handled 321.6 million passengers at its Spanish airports in 2025, earns about half its revenue from regulated airline charges and about a third from shops, food and parking. Commercial revenue grew 11 percent in 2025, more than twice as fast as aeronautical revenue.
The split matters because it is often regulated differently. Under a single till, the regulator counts shop and parking profit when it sets airline charges, so a busy shopping floor lowers the price airlines pay. Under a dual till, only the airport side is regulated and the owner keeps all commercial profit. Across the world's airports, aeronautical revenue was USD 79 billion and non-aeronautical revenue USD 54 billion in 2023, out of USD 146 billion in total, according to the airports' trade body ACI World. Rail can lean even harder on property: in Hong Kong, MTR Corporation builds homes and offices over its stations, and in 2025 its Hong Kong property development earned HKD 13.2 billion of profit before interest and tax while its Hong Kong train operations made a small loss.
Key measures, in plain words
- Traffic: passengers a year at an airport, containers handled at a port (counted in TEU, twenty-foot equivalent units), vehicles a day on a road (average daily traffic), passengers or tonnes on a railway.
- Regulated asset base (RAB): the value a regulator recognises for the assets, on which it allows a return. Heathrow's was GBP 21.3 billion at the end of 2025.
- Allowed return or WACC: the yearly return on the asset base the regulator allows, set close to the owner's cost of capital.
- Charge or yield per user: revenue per passenger, per container or per vehicle kilometre.
- Commercial revenue per passenger: what an airport earns from shops, food and parking for each traveller.
- Utilisation: traffic divided by capacity, such as passengers against terminal capacity or containers against yard and crane capacity.
- EBITDA margin: profit before interest, tax, depreciation and amortisation, as a share of revenue. Toll roads often keep 70 percent or more.
- Concession life left: years until the asset is handed back. Transurban's roads had a weighted average of 27.3 years left in 2026.
- Net debt to EBITDA, and capital spending ahead: these businesses are mostly funded with long-term debt.
Aena had total revenue of EUR 6,379.2 million in 2025, of which EUR 3,346.8 million was aeronautical. What share of revenue came from aeronautical charges, as a decimal? (Round to three decimals.)
An airport is regulated under a single till. Its shops have a record year. What happens to the airline charges at the next review, all else equal?
In a landlord port, who usually buys the cranes and handles the containers?
Sources for this lesson (6)
- Recognized public explanations of case-interview concepts and terms
- Aena, "Annual results 2025" press release, 25 February 2026
- ACI World, "Maximizing non-aeronautical revenues key to airport financial sustainability", 8 May 2025
- World Bank, Port Reform Toolkit, Module 3: alternative port management structures and ownership models
- Transurban, FY26 results presentation (CPI-linked tolls and concession life), 13 August 2026
- MTR Corporation, Annual Report 2025, key figures
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It builds on what you just read, in Transport infrastructure: airports, seaports, toll roads and rail.
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