Airlines Make Their Real Money Selling Miles, Not Seats
Flying passengers is a brutal, cyclical, low margin business. The loyalty programme attached to it is a high margin annuity, and in some years it is worth more than the airline.
Two Businesses in One Company
An airline looks like a transport company. Financially it is two businesses stapled together, and they have almost nothing in common.
The first flies people. It is capital intensive, cyclical, exposed to fuel prices it cannot control, unionised, and competing against rivals who will match any fare. Its long run returns have been famously poor.
The second sells loyalty currency. It has minimal capital requirements, contracted revenue, pricing power, and margins that would suit a software company.
How the Miles Business Works
The airline creates miles at essentially no cost, since they are an accounting entry. It then sells them in bulk to a bank, which uses them as the reward on a co branded credit card.
The bank pays real cash per mile. The cardholder earns miles by spending. Eventually some of them are redeemed for seats, at which point the airline incurs a cost, but that cost is far below what it received, and a meaningful share are never redeemed at all.
The airline is not rewarding you for flying. It is manufacturing a product with almost no marginal cost and selling it to a bank, which is buying your attention on its card.
Additional miles are sold to hotels, car rental firms, and retail partners. The airline is running a currency, and it controls both issuance and the redemption rate, which it can adjust.
The 2020 Proof
When passenger traffic collapsed in 2020, airlines needed to borrow against something. What they pledged was revealing.
Major United States carriers raised billions in secured financing collateralised by their loyalty programmes. Lenders were willing, and the valuations disclosed in those transactions implied that the loyalty business alone was worth a very large fraction of the airline's total market value, in some cases more than the whole company was trading at.
The market had been valuing an airline as an airline. The financing documents valued it as a payments and marketing business that happened to own planes.
Why the Structure Persists
| Flying | Loyalty | |
|---|---|---|
| Capital required | Enormous | Minimal |
| Margin | Thin, volatile | High, stable |
| Pricing power | Almost none | Substantial |
| Cyclicality | Severe | Moderate, tied to card spending |
The two are inseparable because the loyalty programme is only valuable if the miles buy something people want. A programme with no airline behind it is a coupon scheme. The unattractive business is the collateral that makes the attractive one work.
The Breakage Question
Miles issued but never redeemed are called breakage, and recognising revenue on them requires estimating how many will expire unused. That estimate is a judgement, it is material, and it moves reported earnings.
Programmes that devalue miles, requiring more of them per seat, effectively raise prices on a currency holders already earned. It is a reliable source of margin and a reliable source of customer anger, and airlines manage the balance continuously.
What This Means for Analysis
Reading an airline on consolidated numbers blends a low quality business with a high quality one and produces a multiple that describes neither.
The useful approach is to separate them: value the loyalty programme on the economics of a contracted, high margin, capital light annuity, and value the flying operation on the miserable economics it actually has. Several carriers now disclose enough segment detail to attempt this, and the gap between that sum and the market capitalisation is frequently where the interesting question sits.
The Bottom Line
Airlines earn thin and unreliable returns moving people, and strong reliable returns selling miles to banks. The 2020 financings made the relative values explicit when carriers pledged loyalty programmes as collateral and lenders valued them at a large share of the entire enterprise. Analysing an airline as one business misses that the profitable part is a payments partnership wearing a transport company's name.