The Oligopoly Report, Ch. 2: Airlines — the long version.
Your ticket price isn't cost-plus. It's an inventory decision. The same seat sells for $89 or $889 depending on how many cheap "buckets" are left and how many desperate business travelers the airline expects at the last minute. Fuel and wages move the floor. But consolidation decides how much of a cost increase lands on you — and how fast.
Four airlines now control roughly 80% of US domestic travel, assembled by merger: Delta-Northwest, United-Continental, Southwest-AirTran, American-US Airways. On any given route, that's often two real choices. Sometimes one.
And here's how "competition" works when four giants meet on hundreds of routes: no smoke-filled room required. They just watch each other. In 2018, JetBlue raised the first checked-bag fee from $25 to $30. United matched almost immediately. Delta followed. American caved within 24 hours. Nobody undercut anybody — each day of delay was "lost comparative revenue." The industry now pulls $7.27 billion a year out of bag fees alone, per federal data. That's not a conspiracy. It's a market where nobody has a reason to defect.
Economists call it multimarket contact: American meets United on Atlanta–New York, so starting a fare war there means retaliation on Chicago–Miami, LA–Seattle, and forty other routes. One study found mergers raised that repeated contact ~29% — and where it rose, the cheapest fares ran 6.5–14.5% higher. Restraint is more profitable than rivalry, so restraint wins.
Then there's "capacity discipline" — the industry's favorite euphemism for not adding seats. Fewer seats, fuller planes, higher yields. Researchers found that when every airline on a route preached "discipline" on earnings calls, seats got cut up to 4.2% in smaller markets. The DOJ investigated in 2015 and walked away empty-handed. A federal judge in the parallel class action said she could "reasonably infer the existence of a conspiracy." Southwest paid $15 million to make its case go away. Make of that what you will.
Workers get the same deal from the other side of the table. Mergers mean "synergies": duplicate stations closed, maintenance outsourced (70% of heavy airframe repair was outsourced by 2007, per the BLS), seniority lists merged, bankruptcy used as a bargaining weapon. US Airways extracted $6.65 billion in worker concessions in 2002 while paying $6 million in management bonuses. A peer-reviewed study of mergers from 1993–2018 found significant long-term wage and benefit cuts at merged airlines. Fewer employers, fewer outside offers, weaker leverage. Economists call it monopsony. Workers call it Tuesday.
The honest caveat, because this account checks its own BS: average inflation-adjusted fares actually fell ~15% from 2007 to 2024. The claim isn't "every fare went up." It's the counterfactual: how much lower would your fare be — how many more flights would your town have — if the rival that got absorbed were still out there undercutting?
That's the oligopoly business model. Not fixing prices. Fixing the game so nobody has to.
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