Overview
First quarter 2026 results showed a more mixed start to the year across the U.S. airline sector, with a clearer gap between higher-value revenue and overall passenger volumes. Corporate demand was a consistent theme across all four airlines, with volumes strengthening alongside revenues.
United Airlines delivered the strongest profitability in the quarter, supported by cost control, international performance, and a more favorable expense profile. Delta Air Lines continued to lead on revenue, with premium demand, loyalty contribution, and international markets supporting the top line, though this did not translate into the same level of bottom-line strength in the quarter.
American Airlines reported improved revenue but continues to struggle to convert that into meaningful profitability, with cost pressure and execution still weighing on results. Southwest Airlines showed early evidence that its business transformation is beginning to move the numbers, with margin improvement and better revenue performance.
The airlines also flagged rising fuel costs as a growing concern. The situation in Iran is expected to push fuel prices higher into the second quarter and beyond. That will increase cost pressure and will likely feed through into fares. The challenge will be how far pricing can move without affecting demand if this continues.
United versus Delta
The difference between United and Delta in the quarter was driven largely by cost and one-off factors rather than demand. Delta saw a significant increase in fuel-related costs, including an impact tied to its refinery operations, along with higher maintenance expense and a larger hit below the operating line. United benefited from more stable cost progression and favorable items, including gains that supported net income.
United’s performance reflects strong cost control, particularly in fuel and maintenance, while Delta’s results were affected by factors that may prove more temporary. We will monitor how this develops over the next few quarters.
Takeaways
- Revenue continues to separate performance across the sector. Delta remains clearly ahead, with United in a solid second position. American and Southwest are still working to close the gap.
- Corporate demand is improving in both volume and revenue. American reported managed corporate revenue up 13 percent year over year. Delta described corporate sales as double-digit growth and a quarterly record. United reported higher business traveler volumes and growth in premium and international revenues during the quarter. Southwest enjoyed its strongest managed business quarter on record.
- Domestic demand is under pressure, particularly in the main cabin. American and United called out weaker demand in lower-yield segments in addition to a more competitive pricing environment.
- Premium cabins continue to carry a disproportionate share of revenue growth and margin. This gap between premium and economy is becoming more pronounced.
- Cost discipline is holding for United and Southwest, while American continues to face structural cost challenges.
- Loyalty and co-brand credit card economics remain central to profitability, providing a more stable earnings base across cycles.
- Network and capacity decisions are having a more direct impact on margins, load factors and unit revenue, particularly in competitive domestic markets.
In short
United delivered the strongest profitability in the quarter, supported by cost control, international strength, growth in premium, and favorable expense timing. Delta continues to win on revenue led by price and overall consistency over time, but its results in the quarter were affected by higher fuel and maintenance costs. American is showing some progress, but execution still needs to come through consistently and margin recovery remains limited. Southwest is starting to show tangible results from its transformation, though it remains early.
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Airline comparison (Q1 2026)
| Metric | American (AA) | Delta (DL) | United (UA) | Southwest (WN) |
|---|---|---|---|---|
| Total Operating Revenue | $13.91 B | $15.85 B | $14.61 B | $7.25 B |
| Operating Income | -$41 M | $501 M | $997 M | $330 M |
| Operating Margin | -0.3 % | 3.2 % | 6.8 % | 4.6 % |
| Net Income (GAAP) | -$382 M | -$289 M | $699 M | $227 M |
| Earnings per Share (GAAP/Adj.) | -$0.58 / -$0.40 | -$0.44 / $0.64 | $2.14 / $1.19 | $0.45 / $0.45 |
| Load Factor | 81.3 % | 81.6 % | 81.6 % | 74.1 % |
| TRASM / RASM (¢ / ASM) | 19.32 | 22.92 | 18.80 | 17.24 |
| PRASM (¢ / ASM) | 17.35 | 17.79 | 16.95 | 15.68 |
| CASM (¢ / ASM) | 19.38 | 22.20 | 17.52 | 16.46 |
| CASM-ex (¢ / ASM) | 15.29 | 15.13 | 13.95 | 13.11 |
| Average Fuel Cost ($ / gal) | 2.75 | 2.78 | 2.78 | 2.73 |
| Market Cap (May 1, 2026) | ~$7.8 B | ~$45.2 B | ~$29.5 B | ~$19.8 B |
Revenue quality versus cost – quick ROI lens
| Airline | (TRASM – CASM, cents per ASM) |
|---|---|
| American Airlines | -0.06¢ (19.32 – 19.38) |
| Delta Air Lines | +0.72¢ (22.92 – 22.20) |
| Southwest Airlines | +0.78¢ (17.24 – 16.46) |
| United Airlines | +1.28¢ (18.80 – 17.52) |
Revenue quality and cost
Delta continues to lead on the relationship between revenue per seat mile and cost per seat mile, with premium and international demand supporting pricing and margins. United showed the strongest balance between revenue and cost in the quarter, with the highest spread between TRASM and CASM among the four airlines. American’s revenue improved, but cost pressure and operational complexity continue to limit margin expansion, leaving the overall revenue-cost relationship tight.
Southwest showed progress on both revenue and cost, with early benefits from its transformation programme starting to come through in margins.
What changed in Q1 2026?
Delta Air Lines
Delta delivered a steady quarter, with premium and international demand continuing to perform well. The airline highlighted that corporate volumes are improving, not just pricing, which supports a more durable revenue outlook. Loyalty contribution remains a key stabilizer.
United Airlines
United reported solid results but was clear about pressure in domestic markets. Commentary pointed to weaker demand in lower-yield segments and a more competitive environment. Corporate demand trends were described as strong in volume terms.
American Airlines
American showed improvement in revenue, but the gap between revenue and profitability remains. The airline continues to manage cost pressure and operational challenges while working to rebuild its commercial position, particularly in corporate and indirect channels.
Southwest Airlines
Southwest highlighted early benefits from its business transformation, including improved revenue performance and margin expansion. Changes to product, pricing, and commercial strategy are starting to show through, though the model is still evolving.
Travel buyer takeaways
- Delta remains the most reliable option for premium and corporate-heavy programs.
- United is delivering strong financial performance and offers scale. It is closing the gap on premium and corporate.
- American should get more competitive, but buyers should be prepared for some bumps along the way.
- Southwest is becoming more relevant for domestic travel as its product and pricing model evolves.
- Domestic market conditions may create pricing opportunities, but buyers should watch schedule stability and service consistency closely.
What buyers should watch in 2026
- Are airlines actually carrying more business travelers, or are higher fares still doing most of the work?
- Look at how premium cabins perform as the main cabin stays under pressure, and what that means for availability and upgrades.
- Watch how capacity decisions in competitive domestic markets affect schedule stability and recovery during disruption.
- Listen to how airline leadership explains network choices and service trade-offs when challenged.
- Challenge whether loyalty and premium investment show up in everyday program value.
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