Berkshire Buys $2.65B Delta Stake, Breaking Buffett's Airline Vow

What happened

Berkshire Hathaway disclosed a $2.65 billion stake in Delta Air Lines, breaking Warren Buffett's famous rule against airline investments. The purchase, revealed in Q1 2026 13F filing, represents roughly 6% of Delta's outstanding shares and comes as Delta is pivoting to premium cabins and its Amex co-brand ecosystem. This high-profile endorsement follows Delta's 2025 record revenues of $63.4B and 10% operating margin, but the company still faces structural headwinds including main-cabin weakness, rising labor costs, and heavy capital commitments. While Berkshire's stamp of approval may reduce downside risk in the near term, the DeepValue master report maintained a WAIT rating, citing limited margin of safety at current ~$68 and a base-case value of $75. The purchase does not invalidate the report's concerns about premium demand sustainability or potential regulatory impacts on loyalty economics.

Implication

Berkshire’s $2.65 billion acquisition offers tangible evidence that a disciplined value investor sees long-term value in Delta’s premium shift and loyalty-model cash flows. However, the DeepValue analysis suggests the stock already prices in much of the bullish premium-and-loyalty story, trading at 8.8x trailing EPS with a base-case fair value around $75. Key risks—deteriorating main-cabin demand, non-fuel CASM growth above 3%, and potential regulatory crackdowns on credit-card economics—remain largely unchanged by Berkshire’s position. The purchase may encourage momentum-driven buying and tighten the stock's downside, but it does not resolve Delta’s reliance on affluent travelers or the need to execute costly fleet and labor agreements. Investors should view this as a positive sentiment signal but maintain disciplined entry points near $60 (attractive entry per the report) rather than chasing the news.

Thesis delta

Berkshire's stake bolsters the narrative of long-term value in Delta's premium-and-loyalty strategy but does not shift the fundamental risk-reward; the report's thesis remains cautious given the stock's proximity to base-case fair value and its exposure to labor, regulatory, and demand-cycle risks. The primary change is a slightly elevated confidence in Delta's ability to execute, though the margin of safety remains thin.