The airline industry has a structural problem that makes sustained profitability nearly impossible under competitive conditions. This isn't a matter of bad management or bad luck — it's a feature of the industry's economics.
The core problem
Airlines suffer from what economists call an "empty core" — a situation where no stable competitive equilibrium exists. The conditions that create this are straightforward:
- High fixed costs: Aircraft, gate slots, labor agreements, and fuel hedging mean most costs are locked in regardless of how many passengers fly.
- Low marginal costs: Once a flight is scheduled, the cost of filling an extra seat is very low.
- Lumpy capacity: A single aircraft adds 250–300 seats to a route. When demand supports, say, 3.5 flights per day, the market oscillates between three flights (too few, high prices, inviting entry) and four flights (too many, price wars, bankruptcies).
- Undifferentiated product: One airline's seat from San Francisco to Tokyo is largely interchangeable with another's.
- Volatile demand: Economic shocks, fuel spikes, pandemics, and geopolitical events swing demand unpredictably.
This combination means the industry cannot settle into a profitable equilibrium. The core is empty — every arrangement is vulnerable to being undercut by a new entrant or a defecting coalition.
Historical evidence
Since U.S. airline deregulation in 1978, the industry has cumulatively lost money. From 1978 to 2025, net profit sits at negative $37 billion. Between 1978 and 2005, more than 160 airlines filed for bankruptcy. In September 2005, all four largest U.S. carriers — United, Delta, Northwest, and US Airways — were operating under Chapter 11 simultaneously.
Famous names like Pan Am, Eastern, TWA, and Braniff have disappeared. Even budget carriers like Spirit Airlines — which filed for Chapter 11 in November 2024 and again in August 2025 — have been liquidated. Southwest, long the most durable low-cost carrier, hasn't turned a profit since the pandemic.
How airlines cope
Airlines have developed three strategies to escape the empty core:
Tacit cartelization: International alliances (Star, SkyTeam, Oneworld) allow codesharing and revenue coordination on high-value routes. Domestically, the hub-and-spoke model creates fortress hubs where one carrier controls 80–90% of traffic at a major airport.
Frequent flyer programs as profit centers: Delta's partnership with American Express generated about $8 billion in revenue in 2025 — more than the airline