How Do Airlines Actually Make Money?

That's the profit the world's airlines expect to make on you this year. Not on your ticket. On you. The entire trip. The check-in desk. The seat. The bag in the hold. The crew. The fuel. The little cup of soda. When the industry's own trade body published its forecast for 2026, that was the number it put on the average passenger. $7.90. Most American airlines charge you more than that just to put one suitcase in the hold. So how is this a business? Walk through a big hub on a Monday morning, and the scale of the thing is absurd. Machines that cost more than office towers. Park nose to nose. Tens of thousands of people in uniform. Terminals the size of all small towns. And most years now, these companies are profitable. Something is paying for all of that, and it clearly isn't the $8. On 15th of June 2020, with most of its fleet parked on the ground, United Airlines filed a document with regulators that put a public price on something it had never priced in public before. It wasn't a plane. It wasn't a route. Or a gate. Or a terminal. And the number in that filing quietly answers the whole question. The obvious answer is the one everybody gives. Airlines sell seats cheap and then claw it back on the extras. Bags. Seat selection. Priority boarding. The Wi-Fi. The extra legroom. And that's real money. But it doesn't explain the number, because all of it sits inside the same operation. Fuel. Crews. Maintenance. Landing charges. A jet that has to fly whether it's full or not. Bag fees aren't separate from that. They're patching it. And the trade body's own forecast is blunter than anything a critic would put in a headline. This year, the industry is heading for the highest profit it's ever made. And even so, taken as a group, airlines still won't earn back the cost of the money they use. The flying is a bad business. Even in a record year, it's a bad business. The good business started on a Friday in the spring of 1981. On the first of May that year, American Airlines launched a program called A-Advantage. The timing wasn't an accident. The industry had been deregulated a few years earlier. Carriers could suddenly fly where they liked and charge what they liked, and on the busy routes, that meant several airlines selling what was really the same trip. A-Advantage was a way to make one of those airlines feel different. It started as an invitation. American went into its reservation system, worked out who flew the most, and wrote to them. The reward at the top was a first-class ticket to anywhere American flew, and there was exactly one way to earn it. You had to get on a Six years later, American and Citibank did something that looks small and wasn't. They issued a credit card that earned A-Advantage miles. For the first time, you could earn a free flight without going anywhere. That's the hinge. The moment a bank wants miles, miles have a price. And an airline that can set a price on something it prints itself isn't running a thank-you scheme anymore. It's running a mint. Here's the money in order. You buy groceries. The store pays a fee to the bank for handling the card. The bank takes part of that fee and buys miles from the airline. In United's own worked example, filed with regulators, a partner pays as much as two cents each. The bank hands them to you as a reward, which it likes. Because it's a reward, it doesn't have to manufacture. The airline has your money now in cash today. What you have is a promise of a seat. Later, at a price, the airline gets to decide. It even loops back on itself. United buys miles from MileagePlus, which is United. MileagePlus then buys the seat back from United when you redeem them. Same company, two sets of paperwork, a profit booked somewhere in the middle, all of which United had to spell out in public in June 2020. Planes were parked in the desert. The airline was burning cash and needed to borrow against something lenders actually wanted. And what lenders wanted wasn't the fleet. It was the frequent flyer program. In that filing, United ran the arithmetic itself and put a value on MileagePlus. 21.9 billion dollars. Two weeks later, on the last day of June, the market closed with United shares worth less than half of that. The company put the figure in its next annual report. The frequent flyer club was worth more than double what the stock market said United's shares were worth. And the collateral, the things the lenders took first claim on, was a list of trademarks, domain names, patents, the customer database, and a mobile app. No airplanes. Delta did the same thing with SkyMiles. Its annual report still lists the SkyMiles financing agreements among the company's debts. So look at what a mile is now, next to what it used to be. In 1981, it was a thank you note. You had to fly to earn one, and you had to be invited before you could earn any at all. Today, it's a currency an airline manufactures on demand and sells wholesale. And what lands in your account never went near an aircraft. You earn it at the supermarket, the gas station, the vet. Delta's most recent annual report puts a number on it. In 2025, American Express paid the airline 8.2 billion dollars. That was more than Delta's entire pre-tax profit for the year. A bank paid the airline more than the airline made from being an airline. Once you see that, the aircraft changes shape. It stops being the product and turns into the warehouse. The place where the currency finally gets redeemed. The person in seat 14C isn't really the customer. The customer signs multi-year contracts, puts its logo on the wall of the lounge, and never sits down. It's also why flying feels the way it does now. The part of the company under real competitive pressure is the part selling miles to banks. Because a bank can walk away and sign with a rival. You can't walk away as easily, not once you've got a balance you're saving. So here's my opinion, and I want to be clear that it's its opinion rather than a finding. I think loyalty program is now the most misleading phrase in the industry. Loyalty describes something a passenger feels. What these things actually are is a wholesale currency business with an airline attached, and the party they answer to is a bank. That doesn't make anyone a villain. It's a rational answer to running a business. That doesn't earn back its cost of capital even in a record year. But I think it explains the modern flying better than any complaint about legroom does. The department that has to delight somebody is the one selling miles. The department that puts you in a seat is a cost line, which leaves the question I can't settle. If the miles are the product, and the bank is the customer, what is the flight? Cost of goods sold? And if the whole structure now rests on banks buying billions of miles every year because their cardholders want them, what happens on the morning the banks decide they've bought enough?