# U.S. airline capacity adjustments due to fuel costs > Live situation record from CLSTR: https://clstr.news/situations/us-airline-capacity-adjustments-due-to-fuel-costs > Updated: 2026-09-21T10:48:41.000Z. Sources: 27. Developments: 3. Major U.S. airlines, including American Airlines, United Airlines, and Southwest Airlines, are scaling back flight schedules and reviewing unprofitable routes due to a sharp surge in jet fuel prices. American Airlines reported that fuel costs for the fourth quarter could increase by approximately $1 billion because prices are running about $1 per gallon higher than July projections. To manage this, the carrier plans to make capacity adjustments during the latter part of the fourth quarter and may reduce growth projections for 2027. United Airlines has announced it will cancel certain flights scheduled for December and may implement further adjustments starting in the first quarter of 2027 if fuel prices remain high. Southwest Airlines has already reduced its planned capacity expansion for 2026 by about half due to fuel costs, noting that further reductions would be a ‘natural response’ to prolonged high fuel prices. Delta Air Lines is also adjusting its domestic strategy, announcing the elimination of nonstop routes between Seattle and Philadelphia, as well as between New York (JFK) and Dallas/Fort Worth, to better allocate aircraft in competitive markets. Recent developments indicate that the spike in fuel costs is significantly impacting profitability across the sector. The financial strain has already resulted in the permanent closure of Spirit Airlines in May. Industry executives expect the most significant impact of these cuts to be felt by budget-conscious travelers, who may face a ‘double whammy’ of higher base fares and fewer flight options. This follows data from the U.S. Consumer Price Index showing that summer airfares were approximately 25 percent higher than the previous year. ## Claims - Southwest Airlines has reduced its planned 2026 capacity growth projection by roughly half due to high fuel costs. (corroborated by 3 sources) - United Airlines is cutting certain December flights and may implement further reductions in early 2027 to maximize profitability. (corroborated by 3 sources) - Jet fuel prices have reached levels near $4.75 per gallon in some US markets. (corroborated by 3 sources) - Spirit Airlines ceased operations in May due to fuel price pressures. (corroborated by 3 sources) - The jet fuel price spike is projected to add approximately $1 billion to American Airlines' fourth-quarter expenses. (corroborated by 2 sources) - Jet fuel and diesel are both middle distillates, meaning their prices are closely linked. (corroborated by 2 sources) - United Airlines CFO Michael Leskinen noted that demand has not shown signs of weakening despite higher costs. (corroborated by 2 sources) - Airfare prices during June, July, and August were approximately 25 percent higher than the previous year. (corroborated by 2 sources) - Industry expert Zak Griff noted that budget-conscious travelers, rather than business travelers, are most affected by flight reductions. (corroborated by 2 sources) - United, American, and Southwest Airlines expect to eliminate less profitable and cheaper flights later this year. (corroborated by 2 sources) - Airlines have already reduced summer flight numbers and increased baggage fees to offset fuel costs. (corroborated by 2 sources) ## Timeline ### 2026-09-21: Airlines cut flights and raise fares amid rising jet fuel costs Airlines like United, American, and Delta are cutting flights and raising fares as soaring jet fuel costs make budget-friendly and less profitable routes unsustainable. 8 sources. https://clstr.news/cluster/airlines-to-cut-cheap-flights-due-to-high-fuel-costs ### 2026-09-18: US airlines cut flights as jet fuel prices surge Major US airlines like American, United, and Southwest are cutting flights and reducing capacity growth due to surging jet fuel prices, which are significantly impacting operating costs and profitability. 15 sources. https://clstr.news/cluster/major-us-airlines-cut-flights-amid-surging-jet-fuel-prices ### 2026-09-02: Asia-Pacific airlines trim regional flights amid rising fuel costs Asia-Pacific airlines are trimming regional flights to protect long-haul routes as high jet fuel prices and Middle East conflicts impact passenger demand and profit margins. 4 sources. https://clstr.news/cluster/asia-pacific-airlines-trim-regional-flights-amid-rising-fuel-costs --- Cite as: U.S. airline capacity adjustments due to fuel costs. CLSTR, https://clstr.news/situations/us-airline-capacity-adjustments-due-to-fuel-costs