The U.S. Airline Industry in 2026

Delta Air Lines received $8.2 billion from American Express alone in fiscal 2025 — more than Spirit Airlines earned in any year of its history. The figure captures the central puzzle of the modern U.S. airline industry: carriers now earn more operating profit from co-branded credit card partnerships than from selling seats, with passenger revenue per available seat mile below cost at all four major U.S. carriers.

The case traces the industry from 1978 deregulation through the 2013 consolidation wave to the present loyalty economy, asking whether this revenue transformation represents a durable shift in industry structure or a cyclical cushion before the next downturn. Students apply Porter’s Five Forces twice — once with and once without the loyalty economy in view — diagnosing which forces have shifted and which have not. The case is suitable for MBA Strategy, Valuation, Nonmarket Strategy, and Executive Education.

• Apply Porter’s Five Forces framework to an industry undergoing revenue-model transformation, and identify which forces shift materially versus which remain stable.
• Distinguish structural change in industry economics from cyclical variation, and articulate the evidence that would differentiate the two over a forward-looking horizon.
• Explain how revenue-model innovation—specifically, a shift from product sales to partner-subsidized ecosystem monetization—can alter competitive dynamics including switching costs, entry barriers, and the locus of rivalry.
• Develop an assessment of strategic position for a firm that lacks scale advantage on the new profit engine, and generate defensible options for that firm going forward.