United Doesn't Sell Flights. It Sells Miles to a Bank — and Flies You as a Side Effect.

When you swipe a United co-brand credit card at a grocery store, United earns money on a flight you have not booked, may never take, and that costs the airline nothing to provide. JPMorgan Chase buys the miles you just earned; you store them; United pockets the difference. Do this across millions of cardholders and the result is not a rounding error — United's Other operating revenue, much of it the Chase deal, ran about $2.2 billion in just the first nine months of 2024.⁵ The plane is almost beside the point. United looks like an airline. It increasingly behaves like a company that sells a currency to a bank and operates a flight network to make that currency desirable.

The official story is that United is a transportation business that runs a frequent-flyer program on the side, and that its hubs are the engine of its profits. Both halves of that story are quietly wrong. The hubs are real, but the profit doesn't live where it looks like it lives. And MileagePlus is not a side program — it is structured, financed, and increasingly run as a business of its own.

The spokes are bait, the long-haul is the meal

United operates eight hubs — Chicago, Denver, Houston, Los Angeles, Newark, San Francisco, Washington, and Guam — and its own filings explain the architecture plainly: the hub system lets it move passengers between a vast number of destinations with more frequent service than point-to-point flying ever could.¹ But the deeper logic is not domestic convenience. It's leverage. The thin spoke from a mid-size city does not need to be a great standalone business; it needs to deliver a passenger into a hub at the right moment to fill a high-margin seat headed across an ocean. The domestic route is the funnel; the premium long-haul cabin is the well. And the proof is in where the growth concentrates: in the fourth quarter of 2024, premium revenue rose 10% year-over-year, with corporate up 7% — the cabins and customers a feed network exists to fill.²

This is the first cross-subsidy: the spokes don't have to win on their own books, because they exist to make the long-haul win. A flight that would never justify a nonstop becomes worth running once it pours connecting traffic into the seats that matter. That is also why a hub enables international expansion at marginal cost — one extra aircraft on a new overseas route can be fed from dozens of cities at once. The geography does the aggregating for them.

The day United pulled its loyalty program out of the airline

In July 2020, with the pandemic draining cash, United did something that revealed the second, larger cross-subsidy hiding in plain sight. It transferred MileagePlus into a newly formed, bankruptcy-remote subsidiary and borrowed $6.8 billion against it — $3.8 billion in 6.50% senior secured notes plus a $3.0 billion term loan.³⁴ You cannot collateralize a marketing program. You can collateralize a cash-flow machine. The structure, a hybrid between a securitization and a corporate debt issuance, only works because lenders believed MileagePlus generates predictable, durable revenue largely independent of whether the planes are even flying.³ That is the tell: a frequent-flyer program does not get its own subsidiary and its own debt. A business does.

The mechanism behind that valuation is elegant. United sells miles in bulk to JPMorgan Chase, which hands them to cardholders as a reward for spending. United collects cash up front; the cost of redemption is a future seat that often would have flown with an empty space in it anyway. The margin on a sold mile is high precisely because the marginal cost of the eventual redeemed seat is low. So the loyalty program throws off cash that helps carry the whole network's unit economics — and unlike a fare, that cash keeps arriving every time someone buys groceries, not just when they fly. In the fourth quarter of 2024, loyalty revenue grew 12% year-over-year; through the first three quarters of 2025, other operating revenue rose nearly 11%, driven by mileage revenue from non-airline partners including Chase card spending.²⁵

But didn't management say every hub already prints money?

Here is the honest counter, and it cuts at the proudest part of the story. United's chief executive has repeatedly claimed the airline is the only U.S. carrier with every single hub profitable — a clean, quotable moat.⁷ The problem is that it cannot be checked. United does not disclose per-hub profit and loss, so the claim lives entirely on management's word. And the external evidence sits uneasily beside it: commentators have pointed out that United's aggregate profitability has not consistently led its large peers, which is strange for a carrier supposedly enjoying a hub advantage nobody else has.⁷ If every hub really prints money and rivals' hubs don't, the bottom line should show it more decisively than it does. The 'all hubs profitable' line may be true; it is also unfalsifiable, and an unfalsifiable moat is a marketing slogan until the numbers corroborate it.

There is a fairer version of the bull case, though, and it survives the scrutiny. United is genuinely profitable and disciplined — adjusted diluted earnings came in at $10.05 a share for 2023, inside its own guidance, with $681 million accrued for employee profit sharing the same year.⁶ And the MileagePlus financing turned out not to be a desperation crutch but opportunistic leverage: the same structure was later copied by Delta and American, who together with United raised roughly $25.8 billion against their loyalty programs.⁸ United then repaid its MileagePlus-secured debt in full by July 2025 — ahead of both rivals, who are still refinancing theirs.⁸ You don't unwind a structure that fast if you were depending on it to survive. You unwind it fast because it was a clever, temporary use of an asset you valued more than the market did.

Strip away the jet bridges and the route map and you find a company running two cross-subsidies at once: a flight network where unglamorous spokes exist to fatten glamorous long-haul seats, and a loyalty program so financially real that lenders treated it as collateral worth billions. United will keep telling you its hubs are the genius. The more durable genius is quieter and harder to copy — it figured out how to sell a currency to a bank, then build a network worth earning it on. The plane is how you reach the destination. The miles are how United reaches you between flights, every time you spend a dollar somewhere else entirely.