Almost every modern terminal sends departing passengers through a retail hall before they can reach their gate. The arrangement is a revenue decision rather than an accident of building shape.
Airports earn less from airlines than travellers assume
Landing fees and aircraft parking charges are usually regulated or heavily negotiated, which caps what an airport can extract from the carriers themselves.
Airlines also have leverage. A carrier can move capacity to a competing airport, and a hub that loses its anchor airline loses far more than a fee dispute is worth.
So the terminal has to earn elsewhere. Concessions, parking and property income make up a large share of what keeps the airport solvent, and that share has grown.
Security creates a captive audience
Once passengers clear screening they cannot leave, and most arrive with time to spare because the penalty for being late is missing a flight entirely.
That leftover time is the asset. An airport measures it as dwell, and dwell is the raw material that concession rent is priced against.
Retail is therefore placed at the exact point where dwell begins, immediately past the last security lane, when a traveller has just been told the difficult part is over.
A walk-through beats a corridor of shopfronts
Older terminals lined shops along a passage, which let people walk straight past without breaking stride. The walk-through replaces that with a single path that enters the shop floor.
Nobody is obliged to buy, but everyone is exposed. Fixtures are kept low so the onward route stays visible, which removes the feeling of being trapped that would otherwise cause resentment.
The design works because it converts a decision to enter a shop into a decision to leave one, and the second is harder.
Gate information is delivered to keep people calm
Terminals often withhold gate numbers until a set point before departure, which keeps passengers in the central zone rather than dispersed along the piers.
Screens and staff then emphasise that there is time. Anxious passengers walk directly to the gate and sit down; relaxed ones browse, eat and drink.
Long walks to distant gates are tolerable in that framing, and the extra distance passes more shopfronts on the way.
The model shapes what terminals actually sell
Concession leases commonly take a percentage of turnover, so the airport shares directly in what each traveller spends and has an incentive to favour high-value categories.
That pushes the mix towards fragrance, spirits, sunglasses and confectionery, all of which are light, high-margin and bought on impulse rather than researched.
It also explains the food. Sit-down dining occupies space and time, and a terminal will accept slower turnover where the average bill is high enough to justify the floor area.