Flights are being cut and fares are rising fast. United (NYSE:UAL), Delta (NYSE:DAL) and Alaska (NYSE:ALK) warn on profits as the Iran war fuels a jet crisis. What it means for your summer travel.

Key Highlights

  • United Airlines cut its 2026 earnings forecast to $7–$11 per share, down from $12–$14, citing surging fuel costs.
  • S. jet-fuel prices climbed from $2.39 per gallon on February 27 to a peak of $4.78 on April 2, before retreating to approximately $3.51.
  • The Iran conflict has removed more than 500 million barrels of oil from global markets, the largest energy supply disruption in modern history.
  • Europe has approximately six weeks of jet-fuel supply remaining, according to the IEA, creating direct risk for U.S. transatlantic operations.
  • Fuel accounts for approximately 25–30% of total airline operating costs, amplifying margin pressure across the sector.

Markets Are Looking Past a Risk That Is Still Accelerating

Financial markets have largely moved past the early shock of the Iran war. Equities have stabilized and risk sentiment has recovered. Yet inside the global aviation industry, a structurally damaging cost crisis is quietly deepening, with direct implications for U.S. airline profitability, consumer airfare levels, and the wider macroeconomic trajectory.

Aviation is not merely a sector story. When airlines cut capacity, the ripple extends into hospitality, tourism, corporate travel budgets, and ultimately GDP. The Iran conflict's impact on jet-fuel markets may be the most underpriced transmission mechanism in the current economic cycle.

United Airlines Leads a Broad Earnings Reset

United Airlines (NASDAQ:UAL), delivered first-quarter earnings beat on April 22 but simultaneously issued a sharp downgrade to its full-year outlook. The carrier now projects 2026 adjusted earnings per share of $7 to $11, down from prior guidance of $12 to $14 issued in January, before the U.S. and Israel launched strikes on Iran. For the second quarter, it expects adjusted earnings per share of $1 to $2. Fuel costs rose by $340 million in the latest quarter alone, and the airline is reducing planned capacity growth by 5 percentage points, with second-half capacity guided at flat to 2% above prior-year levels.

First-quarter results showed the business remains fundamentally sound. Net income rose to $699 million, or $2.14 per share, an 80% year-over-year increase. Revenue grew approximately 11% to $14.61 billion, ahead of analyst expectations. Premium cabin revenues expanded 14% and basic economy sales rose 7%. The strength of the quarter, however, is now being overshadowed by what lies ahead.

Across the Industry, the Pattern Is Consistent

Delta Air Lines (NYSE: DAL) reported its first quarterly loss in three years, posting a GAAP net loss of $289 million in Q1 2026, with elevated fuel costs a primary driver. Alaska Air Group (NYSE: ALK) went further, suspending its full-year guidance entirely on April 20, disclosing it expects to pay approximately $4.75 per gallon in April compared with a first-quarter average of $2.98. The fuel spike is expected to add $600 million in second-quarter expenses, a $3.60 per share earnings headwind, turning a quarter Alaska had projected as solidly profitable into an anticipated adjusted loss of approximately $1.00 per share. American Airlines (NASDAQ:AAL) reports on April 24 and faces the same environment.

The sector-wide pattern is uniform: strong demand, rising fares, and sharply higher fuel costs compressing margins across every major U.S. carrier.

The Macro Transmission Mechanism

The link between the Iran conflict and U.S. economic conditions runs through energy markets with unusual directness. According to commodity analytics firm, more than 500 million barrels of crude and condensate have been removed from global markets since hostilities began on February 28, the largest energy supply disruption in modern history. U.S. crude futures rose more than 2% on April 22, and volatility remains elevated as cease-fire negotiations remain uncertain.

Jet fuel is structurally harder to scale than gasoline or diesel within refinery operations, meaning crude supply shocks translate into disproportionately severe pressure on aviation fuel availability. U.S. jet-fuel prices stood at $2.39 per gallon on February 27, climbed to $4.78 on April 2, and retreated to approximately $3.51 as of April 21, according to Platts. Even at current levels, the increase is far above the averages airlines built into their original 2026 financial plans.

For the broader economy, higher airfares function as a consumption tax on business and leisure travel. Average domestic summer fares are already running 10% to 15% above year-ago levels, with transatlantic routes up approximately 20%. Combined with tariff-related price pressures and tighter financial conditions, the fuel shock represents a meaningful drag on the 2026 growth outlook.

The European Risk Is a U.S. Problem Too

European carriers are experiencing a more acute version of the same crisis, and the consequences reach directly into U.S. operations. Lufthansa Group announced 20,000 short-haul flight cancellations through October as European jet-fuel prices have doubled since the conflict began. KLM Royal Dutch (KLMR) cut 160 flights in May, citing routes no longer financially viable. Air Canada has suspended select international routes.

Europe imports approximately one-third of its jet fuel, with around three-quarters of those imports historically sourced from the Middle East. The closure of the Strait of Hormuz has effectively severed that supply line. IEA Executive Director Fatih Birol warned last week that Europe has approximately six weeks of jet-fuel supply remaining. IATA Director General Willie Walsh called the outlook "sobering," warning European cancellations could begin by end of May.

This matters directly for U.S. travelers and investors. Non-U.S. airline capacity to and from American airports is expected to contract 2.3% year-over-year in the second quarter, according to Deutsche Bank analysts, tightening transatlantic seat availability further. Order backlogs at Boeing (NYSE:BA) and Airbus extend years into the future, limiting the pace of structural fleet relief.

What Travelers and Investors Should Watch

The summer of 2026 is shaping up to be one of the most consequential seasons for aviation in recent memory. Demand remains robust, but the window between strong demand and structurally higher costs is narrowing fast. For travelers, the implication is straightforward: book early, expect higher fares, and monitor transatlantic schedules closely. For investors, the question is whether current airline valuations fully reflect a fuel environment that may remain elevated well into the second half of the year. The Iran war began as a geopolitical event. It is rapidly becoming an economic one, and aviation is where that transition is most visible.