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# How Big Is an Airline’s Loyalty Business?
- URL: https://abundance.alloconomy.com/alloconomy/who-gets-the-airfare-dollar/
- Published: 2026-10-02T14:48:32.000Z
- Updated: 2026-10-02T14:48:32.000Z
- Description: Compare a major airline's revenue with its bank partnership receipts, then follow the private currency that turns card spending into airline cash.
- Author: Sathya Narayanan
- Tags: Alloconomy, Forms of Money, Businesses

Imagine buying an economy ticket from Bengaluru to London to Seattle. Follow a dollar of the checkout payment. Some belongs to governments collecting passenger taxes. Some pays for distribution: the travel agent or online booking service, and the reservation system connecting it to the airline. The airline's portion pays fuel suppliers, crew, maintenance teams, airports and aircraft owners. Owned planes consume capital through depreciation; leased planes generate lease payments. The split depends on the itinerary, carrier, booking channel and aircraft. Expense accounts reveal those destinations, but cannot supply a universal allocation for this ticket. ([Delta 2025 Form 10-K, operating expenses and Note 2](https://www.sec.gov/Archives/edgar/data/27904/000002790426000013/dal-20251231.htm?ref=abundance.alloconomy.com).)

Now compare that visible business with the one paid by banks. Delta reported **$8.2 billion in American Express remuneration during 2025**, alongside **$63.364 billion in total operating revenue**. These are different measures—partnership remuneration and recognized revenue—but their relative scale makes loyalty worth a closer look. Someone buying groceries with a credit card can earn miles without paying an airfare. What is the bank buying, and how does it support the planes? ([Delta 2025 Form 10-K, business overview and statements of operations](https://www.sec.gov/Archives/edgar/data/27904/000002790426000013/dal-20251231.htm?ref=abundance.alloconomy.com).)

## The airline's other customer

A legacy airline has another business inside it: issuing rewards that banks want to distribute. Creating an additional electronic mile is cheap. Selling it produces real cash. Honoring it eventually requires something considerably less cheap: a seat, an upgrade or a payment to a redemption partner.

The basic transaction runs like this. The bank pays the airline for miles. The bank awards them to its cardholders as they spend. The cardholders redeem them with the airline for travel. In the first transaction, **the bank is the airline's customer**. In the second, **the cardholder is the bank's customer**, and miles are part of the card's reward proposition. In the third, **the member is the airline's redemption customer**: the airline delivers a benefit paid for earlier. A partner-airline award introduces another supplier whom the issuing program must compensate. ([Delta 2025 Form 10-K, Note 2; United 2025 Form 10-K, Note 2](https://www.sec.gov/Archives/edgar/data/27904/000002790426000013/dal-20251231.htm?ref=abundance.alloconomy.com). [United filing](https://www.sec.gov/Archives/edgar/data/100517/000010051726000023/ual-20251231.htm?ref=abundance.alloconomy.com).)

Why would a bank buy this promise? Travel rewards make its card useful and desirable. The airline supplies both the reward and a recognizable brand. Delta works with American Express; United's co-brand agreement is with Chase; American's latest filing describes its Citi relationship. These are contracts between businesses, supported by consumers' desire to travel. ([Delta, United and American 2025 Forms 10-K](https://www.sec.gov/Archives/edgar/data/27904/000002790426000013/dal-20251231.htm?ref=abundance.alloconomy.com); [United](https://www.sec.gov/Archives/edgar/data/100517/000010051726000023/ual-20251231.htm?ref=abundance.alloconomy.com); [American](https://www.sec.gov/Archives/edgar/data/6201/000000620126000014/aal-20251231.htm?ref=abundance.alloconomy.com).)

The Amex figure is broader than an invoice for miles alone. Delta's separately defined loyalty marketing agreements produced **$8.0 billion in cash sales during 2025**, bundling future travel with brand use and benefits such as lounge access and baggage waivers. Calling either receipt pure profit would erase the obligations attached to it. ([Delta 2025 Form 10-K, business overview, liquidity discussion and Note 2](https://www.sec.gov/Archives/edgar/data/27904/000002790426000013/dal-20251231.htm?ref=abundance.alloconomy.com).)

Transportation sells journeys to passengers; loyalty sells banks a reason for people to choose their cards.

## A currency whose issuer writes the rules

Miles perform recognizable functions of money. As a **medium of exchange**, they buy eligible seats, upgrades and partner awards. As a **store of value**, they let members postpone a reward, sometimes for years. As a **unit of account**, they price destinations and cabins: an award chart, or the booking screen that replaces it, tells you what the world costs in miles. The analogy describes a restricted currency, accepted within a contractual network. ([Delta 2025 Form 10-K, SkyMiles description](https://www.sec.gov/Archives/edgar/data/27904/000002790426000013/dal-20251231.htm?ref=abundance.alloconomy.com); [Delta program rules](https://www.delta.com/us/en/skymiles/program-resources/program-rules?ref=abundance.alloconomy.com).)

The restrictions are central to the business. The airline does not offer an ordinary right to exchange your balance back into dollars. Delta's rules prohibit selling or bartering miles, declare that miles are not members' property, and reserve the ability to change award prices even for credits already accumulated. Its miles currently do not expire, but the rules allow account closure in specified circumstances. ([Delta SkyMiles Program Rules, accessed October 2, 2026](https://www.delta.com/us/en/skymiles/program-resources/program-rules?ref=abundance.alloconomy.com).)

The issuer controls how miles enter circulation and what redemption costs. It can require more miles for the same seat, shift to variable prices, or change availability. Your displayed balance can stay constant while its purchasing power falls. The institution owing the benefit also controls the terms on which you collect it.

Unredeemed miles are especially attractive because the airline can keep the cash without supplying the promised travel. But a mile that has not been redeemed yet is not automatically profit. It might still be used. The difference between *not yet* and *never* leads directly to the balance sheet.

## The miles waiting on the balance sheet

Under the revenue-recognition rules known as **ASC 606**, airlines allocate a transaction's consideration among its promised benefits. A ticket earning miles buys both present transportation and a future reward. A bank agreement can buy travel awards, marketing and other benefits. The portion assigned to future awards is deferred revenue: cash or consideration received, with performance still owed. ([Delta and United 2025 Forms 10-K, Note 2](https://www.sec.gov/Archives/edgar/data/27904/000002790426000013/dal-20251231.htm?ref=abundance.alloconomy.com); [United](https://www.sec.gov/Archives/edgar/data/100517/000010051726000023/ual-20251231.htm?ref=abundance.alloconomy.com).)

That liability is measured in dollars. It is neither the miles' cash-out value nor the expected fuel bill for honoring them. Airlines estimate the selling value of award travel, adjusted for expected redemption behavior. Revenue generally emerges when miles are redeemed and transportation is provided; expected non-redemption also releases revenue under the breakage policy. Brand and other benefits follow their own recognition schedules. ([Delta 2025 Form 10-K, Note 2](https://www.sec.gov/Archives/edgar/data/27904/000002790426000013/dal-20251231.htm?ref=abundance.alloconomy.com).)

The resulting amounts are large enough to be businesses in their own right:

| Measure                                                         | Reported figure | Primary source                                                                                                                                                                                                                                                                                        |
| --------------------------------------------------------------- | --------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Delta loyalty deferred revenue, year-end 2025                   | $9.262 billion  | [Delta 2025 10-K, Note 2](https://www.sec.gov/Archives/edgar/data/27904/000002790426000013/dal-20251231.htm?ref=abundance.alloconomy.com)                                                                                                                                                             |
| United frequent-flyer deferred revenue, year-end 2025           | $7.777 billion  | [United 2025 10-K, Note 2](https://www.sec.gov/Archives/edgar/data/100517/000010051726000023/ual-20251231.htm?ref=abundance.alloconomy.com)                                                                                                                                                           |
| Delta Amex partnership remuneration, 2025                       | $8.2 billion    | [Delta 2025 10-K, business overview](https://www.sec.gov/Archives/edgar/data/27904/000002790426000013/dal-20251231.htm?ref=abundance.alloconomy.com)                                                                                                                                                  |
| Delta total reported operating revenue, 2025                    | $63.364 billion | [Delta 2025 10-K, statements of operations](https://www.sec.gov/Archives/edgar/data/27904/000002790426000013/dal-20251231.htm?ref=abundance.alloconomy.com)                                                                                                                                           |
| United group operating margin / MileagePlus EBITDA margin, 2019 | 9.9% / 34%      | [United 2020 10-K](https://www.sec.gov/Archives/edgar/data/100517/000010051721000016/ual-20201231.htm?ref=abundance.alloconomy.com); [financing presentation, June 15, 2020](https://www.sec.gov/Archives/edgar/data/100517/000110465920073190/tm2022354d3%5Fex99-1.htm?ref=abundance.alloconomy.com) |
| Borrowing secured by United's loyalty-program assets, July 2020 | $6.8 billion    | [United 2020 10-K, Note 10](https://www.sec.gov/Archives/edgar/data/100517/000010051721000016/ual-20201231.htm?ref=abundance.alloconomy.com)                                                                                                                                                          |

The margins measure different things; the group includes loyalty. The cover labels the measures and distinguishes borrowing from rewards owed. It does not depict an undisclosed profit margin or breakage rate.

Delta's liability shows how receipts and revenue separate. Its opening **$8.826 billion** balance gained **$4.892 billion** from miles earned, then lost **$4.237 billion** through travel redemptions and **$219 million** through non-travel redemptions, ending at **$9.262 billion**. Those are dollar allocations, not mile counts. Issuance includes miles earned through both flying and partners. ([Delta 2025 Form 10-K, Note 2, loyalty roll-forward](https://www.sec.gov/Archives/edgar/data/27904/000002790426000013/dal-20251231.htm?ref=abundance.alloconomy.com).)

The cash can already be helping fund the airline while the related revenue waits to be earned. Deferred revenue is an obligation, but it also provides financing without paying the member interest.

## Inflation without an automatic write-down

A devaluation is easy to understand from the member's side: the same journey consumes more of your balance. The accounting claim requires more care.

American's **November 17, 2015** announcement said awards on some routes to Europe and Asia would increase for bookings beginning **March 22, 2016**. That was an explicit change to what members' accumulated currency could buy. ([American's 2016 AAdvantage announcement](https://americanairlines.gcs-web.com/news-releases/news-release-details/american-airlines-introduces-2016-aadvantager-program?ref=abundance.alloconomy.com).)

What happened to the reported liability afterward? American's deferred revenue for miles sold to partners **rose from $1.5 billion at the end of 2015 to $2.1 billion at the end of 2016**. These historical figures use the earlier accounting rules and cover a narrower obligation than today's loyalty liability. They are a before-and-after comparison within that historical measure, not a comparison with the modern table. ([American 2016 Form 10-K, p. 77](https://www.sec.gov/Archives/edgar/data/6201/000119312517051216/d286458d10k.htm?ref=abundance.alloconomy.com).)

This does not establish that devaluation had no accounting effect. New issuance and redemptions also move the balance. It establishes that the visible liability did not simply shrink after prices changed, and the filing does not isolate a devaluation-related write-down.

The mechanism is subtler than marking all existing miles down to a new dollar price. Deferred revenue records allocated consideration. Raising redemption prices can reduce the travel required to extinguish a given number of miles. Updated valuation or redemption estimates can affect accounting, but a changed award chart does not automatically erase previously deferred dollars. United's financing presentation explicitly describes variable award pricing as a tool for controlling redemption costs. ([United MileagePlus financing presentation, June 15, 2020, p. 23](https://www.sec.gov/Archives/edgar/data/100517/000110465920073190/tm2022354d3%5Fex99-1.htm?ref=abundance.alloconomy.com); [Delta 2025 Form 10-K, critical accounting estimates](https://www.sec.gov/Archives/edgar/data/27904/000002790426000013/dal-20251231.htm?ref=abundance.alloconomy.com).)

The inflation tax falls on members as lost purchasing power. The airline's benefit can appear through lower redemption costs or different future allocations. A quantified liability release needs its own evidence.

## The miles that never come back

**Breakage** means rewards expected never to be redeemed. The gift-card analogy is exact in its central feature: a business receives cash, promises later consumption, and knows some holders will never collect.

An airline cannot assume every idle account is abandoned. Delta uses historical redemption patterns and statistical models. United models the probability of an account redeeming its current balance and reviews its estimate annually. Both recognize expected breakage proportionally as the remaining miles redeem. Revenue can therefore emerge before an individual unused balance formally expires. Non-expiring miles can still have breakage. ([Delta and United 2025 Forms 10-K, Note 2](https://www.sec.gov/Archives/edgar/data/27904/000002790426000013/dal-20251231.htm?ref=abundance.alloconomy.com); [United](https://www.sec.gov/Archives/edgar/data/100517/000010051726000023/ual-20251231.htm?ref=abundance.alloconomy.com).)

The latest filings reviewed here do **not disclose an actual breakage rate or a separate annual breakage-revenue amount**. American supplies a sensitivity: a hypothetical **10% increase in estimated miles never redeemed** would raise annual revenue by approximately **$140 million**. This is not a measured breakage rate. ([American 2025 Form 10-K, p. 78](https://www.sec.gov/Archives/edgar/data/6201/000000620126000014/aal-20251231.htm?ref=abundance.alloconomy.com).)

A historical disclosure shows a real adjustment moving revenue. American's **2015 Form 10-K** reports that a lower breakage assumption reduced revenue by **$43 million in 2011**. Expecting more members to collect their rewards meant recognizing less revenue. This is an identified estimate effect, rather than an inferred consequence of an award-price change. ([American 2015 Form 10-K, p. 56](https://www.sec.gov/Archives/edgar/data/6201/000119312516474605/d78287d10k.htm?ref=abundance.alloconomy.com).)

Rewards that never redeem avoid fulfillment costs and release deferred revenue. They still share the program's marketing, technology and administration expenses. Even here, revenue and pure profit are different quantities.

## What the planes make possible

The economic inversion runs in both directions. **Loyalty cash flows subsidize and stabilize flying:** banks pay for rewards generated by everyday spending, giving the enterprise income beyond the next ticket sale. **Flying gives the currency its utility:** desirable destinations, schedules and redemption partners make the promise worth acquiring. Without that network, the airline has scrip people have little reason to want.

“Loss-leader” captures that relationship, but does not prove every flight loses money. United's financing presentation reported a **34% MileagePlus EBITDA margin for 2019**, calculated against cash flows from sales. United's consolidated operating margin was **9.9%**, derived from its income statement. EBITDA means earnings before interest, taxes, depreciation and amortization. It excludes costs that operating income includes; the program also receives payments from United itself. These measures do not precisely separate the two engines. ([MileagePlus presentation, pp. 9 and 26](https://www.sec.gov/Archives/edgar/data/100517/000110465920073190/tm2022354d3%5Fex99-1.htm?ref=abundance.alloconomy.com); [United 2020 Form 10-K](https://www.sec.gov/Archives/edgar/data/100517/000010051721000016/ual-20201231.htm?ref=abundance.alloconomy.com).)

In **July 2020**, United's loyalty subsidiaries borrowed **$6.8 billion** and lent the proceeds to the airline after reserving funds. The pledged assets included brand rights, member data and accounts receiving payments from banks and United. Program cash had to pay lenders' interest and principal first. **The deferred-revenue liability meant rewards owed to members; it was not the collateral.** ([United June 15, 2020 Form 8-K](https://www.sec.gov/Archives/edgar/data/100517/000110465920073190/tm2022354d3%5F8k.htm?ref=abundance.alloconomy.com); [United 2020 Form 10-K, Note 10 and financing risks](https://www.sec.gov/Archives/edgar/data/100517/000010051721000016/ual-20201231.htm?ref=abundance.alloconomy.com).)

United's **June 15, 2020** filing valued MileagePlus at approximately **$21.9 billion**, using **12 times its 2019 EBITDA**. That estimated business value was not the borrowing amount or an independent appraisal. For perspective, United reported **$10.0 billion** as the market value of shares held by non-affiliates on **June 30, 2020**. Shares represent owners' value after debts; the program figure valued a business operation. Delta also borrowed **$9.0 billion** against SkyMiles assets that year. ([United June 15, 2020 Form 8-K](https://www.sec.gov/Archives/edgar/data/100517/000110465920073190/tm2022354d3%5F8k.htm?ref=abundance.alloconomy.com); [United 2020 Form 10-K, cover](https://www.sec.gov/Archives/edgar/data/100517/000010051721000016/ual-20201231.htm?ref=abundance.alloconomy.com); [Delta 2020 Form 10-K](https://www.sec.gov/Archives/edgar/data/27904/000002790421000003/dal-20201231.htm?ref=abundance.alloconomy.com).)

Resilience is a better description than automatic counter-cyclicality. United's financing presentation showed revenue falling **19%** at United and **2%** at MileagePlus during the **2008–2009** recession. Both declined; the program declined less. ([MileagePlus presentation, p. 21](https://www.sec.gov/Archives/edgar/data/100517/000110465920073190/tm2022354d3%5Fex99-1.htm?ref=abundance.alloconomy.com).)

This support is not immune to recession or partner concentration. Delta identifies American Express as its most valuable miles contract, and its debt covenants restrict loyalty changes that could impair repayment. The issuer's freedom to adjust the currency operates inside commercial and financing constraints. ([Delta 2025 Form 10-K, business overview and risk factors](https://www.sec.gov/Archives/edgar/data/27904/000002790426000013/dal-20251231.htm?ref=abundance.alloconomy.com).)

## Who is paying for whose business?

Return to the opening dollar. A ticket payment purchases transportation and, when eligible, a future reward. Taxes leave for governments; distribution and operating costs fund the delivery network; any remainder supports the enterprise's other expenses and returns. An award ticket draws on an earlier payment allocated to loyalty, with the traveler still potentially owing taxes and charges. ([Delta 2025 Form 10-K, Note 2](https://www.sec.gov/Archives/edgar/data/27904/000002790426000013/dal-20251231.htm?ref=abundance.alloconomy.com); [SkyMiles Program Rules](https://www.delta.com/us/en/skymiles/program-resources/program-rules?ref=abundance.alloconomy.com).)

When you earn miles without flying, the bank is the airline's paying customer. You are the bank's customer and the eventual claimant on the airline's promise. The bank buys a reward proposition; the airline receives cash and obligations; you receive spending power whose rules the issuer can change. Asking what a mile is “worth” therefore means asking what it can buy for you, what it costs the airline to honor, and what the bank pays to obtain it. Those amounts need not coincide.

Look for the same arrangement in gaming currencies, platform credits and gift-card float. A costly underlying service gives a cheaply issued balance somewhere desirable to be spent. The useful questions concern who prepays, who must fulfill, who sets redemption prices, and who benefits when balances remain unused. The sidecar can finance the core; the core supplies the sidecar's meaning.

When a company rewards you with its own currency, who controls what your saved balance will buy when you finally spend it?

## Sources

- [Delta 2025 Form 10-K](https://www.sec.gov/Archives/edgar/data/27904/000002790426000013/dal-20251231.htm?ref=abundance.alloconomy.com): business overview; operating expenses; critical accounting estimates; Note 2, pp. 63–65; liquidity and loyalty-backed debt risks.
- [United 2025 Form 10-K](https://www.sec.gov/Archives/edgar/data/100517/000010051726000023/ual-20251231.htm?ref=abundance.alloconomy.com): Note 2, pp. 70–72, including partner contracts, breakage and deferred revenue.
- [American 2025 Form 10-K](https://www.sec.gov/Archives/edgar/data/6201/000000620126000014/aal-20251231.htm?ref=abundance.alloconomy.com): critical accounting estimates, pp. 77–78, and loyalty accounting in Note 1.
- [American announcement, November 17, 2015](https://americanairlines.gcs-web.com/news-releases/news-release-details/american-airlines-introduces-2016-aadvantager-program?ref=abundance.alloconomy.com); [American 2016 Form 10-K, p. 77](https://www.sec.gov/Archives/edgar/data/6201/000119312517051216/d286458d10k.htm?ref=abundance.alloconomy.com): award changes and historical partner-mile deferred revenue.
- [American 2015 Form 10-K, p. 56](https://www.sec.gov/Archives/edgar/data/6201/000119312516474605/d78287d10k.htm?ref=abundance.alloconomy.com): identified 2011 breakage-estimate adjustment.
- [United Form 8-K and MileagePlus investor presentation, June 15, 2020](https://www.sec.gov/Archives/edgar/data/100517/000110465920073190/tm2022354d3%5F8k.htm?ref=abundance.alloconomy.com), presentation pp. 9, 21, 23 and 26 ([presentation](https://www.sec.gov/Archives/edgar/data/100517/000110465920073190/tm2022354d3%5Fex99-1.htm?ref=abundance.alloconomy.com)); [United 2020 Form 10-K](https://www.sec.gov/Archives/edgar/data/100517/000010051721000016/ual-20201231.htm?ref=abundance.alloconomy.com), cover and Note 10; [Delta 2020 Form 10-K](https://www.sec.gov/Archives/edgar/data/27904/000002790421000003/dal-20201231.htm?ref=abundance.alloconomy.com): program economics, valuation and collateral financing.
- [Delta SkyMiles Program Rules](https://www.delta.com/us/en/skymiles/program-resources/program-rules?ref=abundance.alloconomy.com), accessed October 2, 2026: permitted redemptions, issuer discretion, transfers, expiration and passenger charges.