A record $38 billion pile of frequent-flyer points is powering the summer travel season. It also exposes what airlines have quietly become: credit-card marketing machines that happen to own planes.
Airlines earn a 3% to 6% margin flying passengers, but the margin on selling miles to a bank runs 50% to 70%, according to McKinsey. That gap is why credit cards now shape everything from which routes airlines fly to who gets into the lounge. This summer’s travel is being fueled by a $38 billion stockpile of points.
Book a flight this summer and you are a passenger. To Delta, American, United, and JetBlue, you are also something more valuable: a potential cardholder. The plane ticket is increasingly the loss leader. The credit card is the business.
What Happened
A new Wall Street Journal report lays out how completely credit cards have taken over airline strategy. The clearest number comes from Delta: American Express is on track to pay the airline about $9 billion this year just for the miles Delta hands to Amex cardholders, up 10% from 2025, according to CEO Ed Bastian on Delta’s latest earnings call.
That is not a rounding error. It is one of the largest single revenue relationships in the airline industry, and it comes from a bank, not from flying anyone anywhere.
The mechanics are simple. Banks buy miles from airlines in bulk, then award those miles to customers for signing up and swiping. Every purchase on a co-branded card sends money to the airline. Across the industry, travelers are now sitting on a stockpile of unredeemed points that airlines value at roughly $38 billion, a reservoir of locked-in future demand that keeps seats full even when fuel prices swing and the economy wobbles.
The Backstory
Airline loyalty programs started as a way to make you fly the same carrier twice. They have become the profit center.
The shift accelerated after the pandemic, when airlines leaned hard into premium travelers and the cards that serve them. Most frequent-flyer programs now award status based on how much you spend, with heavy weight on credit-card spending, rather than how far or how often you actually fly. The card, not the boarding pass, is the thing airlines most want in your wallet.
The competitive pressure is now universal. Budget carriers say they cannot survive without a card. Breeze Airways launched a co-branded card with Barclays within three years of starting up. Its chief commercial officer called it “a competitive element of survival.”
The Plan
Once the card is the product, every other decision bends around it. The WSJ reporting shows this playing out on three fronts.
Routes. JetBlue picked its new Milan and Barcelona flights partly by studying where its TrueBlue cardholders were already vacationing. It killed a Minneapolis-to-Boston route partly on how few of those flyers held its card. A money-losing route can be worth flying if the cardholder economics sitting on top of it turn the whole thing profitable.
Real estate. Airlines are in an arms race to build luxe lounges, because a lounge justifies a pricier card. Southwest, historically the anti-frills airline, has quietly secured lounge space in Honolulu and Nashville. When JetBlue opened its BlueHouse lounge at JFK, a line formed out front. Executives feared overcrowding. It turned out people were signing up for the card on their phones to get instant access.
Perks as leverage. United now makes its co-branded card the only way to earn miles on the cheapest basic-economy fares, and gives cardholders at least 10% off award bookings. Delta rolled out cheaper business-class fares that strip out lounge access unless you hold the right Amex. The pattern is the same: make the card the key that unlocks everything else.
The Business Model Angle
Here is the reframe that matters for anyone studying business models. A modern full-service airline is really two businesses stacked on top of each other.
The bottom business flies planes. It is capital-heavy, fuel-exposed, unionized, weather-dependent, and lucky to clear a mid-single-digit margin. On its own, it is a brutal business, which is why airlines go bankrupt with such regularity.
The top business sells miles to a bank. It is asset-light, recurring, and carries a 50% to 70% margin. McKinsey’s Ryan Mann calls loyalty programs “truly core strategic assets” that “drive a lot of the profits for airlines.”
The trick is that the top business cannot exist without the bottom one. Nobody wants a mile they cannot redeem for a seat. So the airline runs the low-margin flying operation partly as customer acquisition and engagement for the high-margin card operation. The route map is the top of the funnel. The lounge is the sales floor. The status tier is the retention program.
That inverts how most people think about airlines. They are not transport companies with a rewards club bolted on. They are loyalty and payments businesses that operate an expensive fleet in order to have something worth being loyal to.
The Risk
Two things could crack this model.
The first is regulation. Rewards cards run on interchange, the swipe fees merchants pay every time a card is used. Those fees are baked into prices, so even cash customers effectively subsidize the miles. A bipartisan group of lawmakers has spent years trying to cap swipe fees. Airlines and banks argue that capping them would gut rewards programs. They are not wrong, and that is exactly the point: the entire $38 billion edifice rests on a fee structure that regulators keep circling.
The second is customer trust. Airlines have quietly made status harder to earn by flying and easier to buy by spending. Push devaluation too far, or lock too many perks behind the card, and the miles people are hoarding start to feel like a currency the airline can inflate at will. The stockpile is an asset today. It is also a liability the airline owes, and loyalty currencies only work while people believe in them.
Quick Questions
How much do airlines make from credit cards? A lot, and rising. American Express is on track to pay Delta roughly $9 billion in 2026 alone for miles, up 10% year over year. Industry-wide, selling miles to banks carries a 50% to 70% margin, far above the 3% to 6% airlines earn flying passengers.
Why are airline points worth $38 billion? That figure is the value of unredeemed points travelers are holding across the major programs. For airlines it represents both a liability they owe in future flights and a reservoir of locked-in demand that keeps seats full.
What is an airline mile actually worth? An American AAdvantage mile is generally valued at 1.3 to 1.5 cents. Redemption value swings with how you use it, which is why savvy cardholders chase high-value routes and upgrades rather than cashing out at the floor.
Are airline credit cards worth it? For frequent travelers who use the perks, often yes. Sign-up bonuses (one WSJ example cited 80,000 miles), free checked bags, and lounge or upgrade access can outweigh the annual fee. The math tips toward the card the more you fly and spend.
The Business Model Analyst Take
The lesson here is bigger than airlines. It is what happens when a company discovers that a slice of its operation is dramatically more profitable than the thing customers think it sells.
Once Delta realized the mile is worth more to a bank than the seat is worth to a passenger, the rational move was to reorganize the whole company around the mile. The flights did not stop mattering. They just became the acquisition channel for something more lucrative. This is the same move Amazon made with AWS underwriting retail, and the same one grocery chains make with loyalty data. The visible product subsidizes the invisible, high-margin one.
For founders, the takeaway is to know which of your businesses is actually the business. The airlines that win the next decade will not be the ones with the newest planes. They will be the ones whose loyalty program is deep enough that a bank will pay billions to rent it. The plane is the cost of entry. The card is the prize.
Reporting and figures via The Wall Street Journal, “A Monster Pile of Airline Points Is Supercharging Summer Travel” (July 16, 2026). Margin data attributed to McKinsey; Delta-Amex figures from Delta’s earnings call.
