Spirit Airlines is gone. Jet fuel is up 30%, and Delta still posted record sales.
Those facts should not add up. They do, because the flyers left in the sky are not the ones who used to buy cheap seats.
Delta's 2025 sales hit $58.3 billion, an all-time high. Yet basic seats brought in $1.1 billion less than the year before.
The gap got filled by premium cabins, loyalty, and cargo. Those now drive 60% of total sales.
United told a similar story. Premium seats sales were up 11% for the year, and profit hit $3.5 billion.
CEO Ed Bastian called it a "K-shape" market. The top half spends more, while the bottom half pulls back.
That split is brutal for any airline built on cheap seats.
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U.S. airlines spent $5.06 billion on jet fuel in March. That was up 30% from March 2025, per the Department of Transportation.
Smaller airlines took the worst hit, since they can't spread costs across as many seats.
Kyle Potter, editor of Thrifty Traveler, said cheap fares no longer cover the math. Airlines need scale to win.
The Big Three of American, Delta, and United have used size and credit-card programs to push smaller players out.
Some airlines are still finding lanes. Allegiant, Breeze, and Avelo fly between smaller cities the majors ignore.
Potter said any of them that tries to grow into a big national player will get crushed. Allegiant just closed its buy of Sun Country in May.
The deal was built to scale up enough to survive.
A 2024 OAG Traveler Survey found 27% of millennials would pay about $100 more to fly with a full-service airline. Only 17 to 18% of Gen Xers and boomers said the same.
Rob Mather of IFS said the shift is not really about fancier seats. It's about auto rebooking, free bags, and a service line that picks up.
Bag and seat fees close the price gap anyway. That has changed how a lot of flyers shop for a ticket.
JetBlue is exiting the Manchester, NH market on July 7. Southwest pulled out of O'Hare to consolidate all flights at Midway.
Spirit's strongest markets - Fort Lauderdale, Orlando, Las Vegas - are getting picked up by JetBlue and Southwest. The basic seat is not dead, but the airlines selling it are shrinking fast.
Salt Lake City-based Breeze Airways says it is not really a budget airline. The startup was founded by JetBlue's David Neeleman.
Instead of fighting on the same routes, Breeze flies nonstop from spots like Akron-Canton, Ohio and Bend, Oregon. The majors don't land there at all.
For investors, the takeaway is simple. The premium half of air travel is funding nearly every record at the big airlines, while the budget half keeps shedding seats.
The cheap fare did not quite die. But the flyers most likely to need it are the ones most likely to lose it.
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