Travelers planning summer trips may find fewer flights and higher fares waiting for them. Airlines across North America are slashing routes and trimming schedules as jet fuel prices climb and inventories shrink, forcing carriers to make hard choices about where and how often they fly during the busiest travel season of the year.
Air Canada announced it will suspend service between Toronto, Montreal, and New York’s John F. Kennedy International Airport for nearly five months, from June 1 through October 25, 2026. The carrier pointed directly to jet fuel prices and deteriorating route economics as the reason, according to the Associated Press. Pulling two high-profile cross-border routes for the bulk of summer and into fall is not a routine seasonal adjustment. It signals that the math on certain flights simply no longer works at current fuel costs.
U.S. carriers are following a similar playbook. United Airlines has cut roughly 5% of its planned flights, while Delta Air Lines has reduced its June seat capacity by approximately 3.5% compared with its original schedule, according to separate AP reporting. Those figures reflect airline-level schedule changes visible in public filings and booking systems. Separately, a BNP Paribas analysis cited in that same coverage estimated that global airline schedules for April 2026 were trimmed by about 5% versus earlier plans. That estimate is an outside analyst’s calculation based on schedule data, not a figure confirmed directly by the airlines themselves, so it should be read as informed modeling rather than carrier-verified capacity numbers. For passengers, a 5% network-wide reduction at a major carrier can translate into dozens of daily departures vanishing, particularly on thinner routes where rising fuel costs quickly eat into already slim margins.
Why jet fuel is squeezing airlines now
The pressure on airlines traces back to a tightening physical fuel market. The U.S. Energy Information Administration, which tracks jet fuel inventories on a weekly and monthly basis, has shown stocks trending below their five-year seasonal averages. At the same time, the Federal Reserve Bank of St. Louis publishes a monthly price series for kerosene-type jet fuel on the U.S. Gulf Coast, tracked under the identifier MJFUELUSGULF, which has reflected a sustained upward move in recent months.
Fuel typically accounts for 20% to 30% of an airline’s operating costs, so even moderate price increases ripple quickly through route profitability calculations. When inventories are also declining, carriers face a double bind: the fuel they need costs more, and there is less cushion in the supply chain if demand spikes or supply is disrupted unexpectedly.
Jet fuel faces specific supply-side pressures that do not apply equally to all petroleum products. Kerosene-type jet fuel is a middle-distillate product that competes for refinery output with diesel and heating oil. When refinery capacity is constrained, whether because of planned maintenance, unplanned outages, or permanent closures of older facilities, the available distillate output must be split among those competing products. Crack spreads, which measure the difference between the price of refined products and the cost of crude oil, have widened for jet fuel relative to gasoline in recent months, reflecting the fact that refiners are struggling to keep pace with jet fuel demand even as gasoline markets remain more comfortably supplied. Several refineries in the U.S. and Europe have either closed or converted to biofuel production in recent years, reducing the total distillate-capable capacity at a time when air travel demand has rebounded sharply from pandemic lows. The result is a structural tightness in jet fuel specifically, layered on top of broader crude oil market dynamics.
The International Energy Agency has flagged the risk. In its periodic oil market reports, the IEA has used a framework built around metrics like days-of-supply coverage to assess where shortages could emerge. The specific report name and publication date for the threshold analysis referenced in AP coverage have not been identified in the available sourcing, so the precise parameters of that framework cannot be independently verified from the cited materials. Under certain inventory conditions, the IEA has warned that select airports could face fuel availability problems. Market analyst Argus has offered on-the-record commentary supporting the view that supplies are lagging behind demand, as summarized in AP reporting. Neither assessment documents widespread outages today, but both underscore that the system is running tight enough for localized disruptions to become real if anything goes wrong.
What this means for summer travelers
The most immediate impact is fewer choices. Air Canada passengers who relied on direct Toronto-JFK or Montreal-JFK service will need to reroute through other carriers or connecting flights for nearly five months. On the U.S. side, United and Delta have not publicly detailed which specific cities or flight numbers are affected by their capacity pullbacks, so travelers may not know their itinerary has changed until they receive a schedule-change notification or check booking availability.
Higher fares are the predictable companion to fewer seats. When airlines remove capacity from the market, the remaining flights absorb more demand, giving carriers pricing power. Industry data from past fuel-driven schedule cuts, including the sharp pullbacks during the 2008 oil price spike and the post-2022 surge following Russia’s invasion of Ukraine, shows that fare increases tend to follow capacity reductions within weeks, particularly on routes where competition thins out.
Travelers who have not yet booked summer flights may want to lock in fares sooner rather than later, especially on cross-border and international routes where the cuts appear most concentrated. Monitoring airline booking systems directly remains the most reliable way to spot schedule changes before they cascade into last-minute rebooking headaches.
What remains unclear
Several important questions do not yet have firm answers. No primary data on global jet fuel inventories beyond the U.S. EIA figures has surfaced in the reporting, which means international shortage assessments lean on the IEA’s analysis rather than raw inventory numbers from other regions. The specific inventory thresholds that would trigger more severe IEA warnings have not been published in available sources.
Neither United nor Delta has explained on the record why specific routes or frequencies were cut, or how much of the reduction stems from fuel costs versus other pressures like staffing constraints or aircraft delivery delays. That ambiguity makes it difficult to predict which routes face further risk.
The duration of the squeeze is also an open question. Air Canada’s suspension has a concrete end date of October 25, 2026, but no carrier or industry group has offered guidance on whether fuel-driven cuts will persist into late 2026 or beyond. The EIA and FRED datasets track conditions in near-real time but do not forecast future supply or pricing. Analysts can extrapolate from recent trends, but those projections remain speculative without public planning assumptions from the airlines themselves.
Geopolitical risk adds another variable. Escalations in oil-producing regions, new sanctions, or shipping disruptions could tighten jet fuel markets further, but the reporting does not quantify those scenarios or link them to specific airline decisions. Whether carriers will prioritize domestic routes over international service, or whether leisure travelers will absorb a disproportionate share of cuts, is a reasonable expectation based on past industry behavior but not a confirmed strategy in the current environment.
How inventory and price data will shape what happens next
The verified facts paint a picture of a stressed but not yet broken fuel market. Airlines are proactively trimming capacity to protect margins, not grounding fleets because fuel is unavailable. That distinction matters. The situation is closer to a managed squeeze than a crisis, at least for now.
But the margin for error is thin. Inventories that are already below seasonal norms leave little buffer for unexpected demand surges or supply disruptions. If refinery output does not recover or if geopolitical events further constrain crude flows, the targeted schedule cuts visible today could widen into something more disruptive by midsummer.
For now, the clearest signal comes from what airlines are actually doing with their schedules. When a carrier like Air Canada pulls a marquee route for five months and says fuel costs are the reason, it translates abstract market data into a concrete reality for anyone trying to book a flight. The EIA inventory figures and Gulf Coast price data will continue to serve as the most reliable public indicators of whether conditions are stabilizing or deteriorating. Travelers, airlines, and policymakers alike will be watching those numbers closely in the weeks ahead.
More from Morning Overview
*This article was researched with the help of AI, with human editors creating the final content.
