Air cargo's traditional peak season is showing muted activity, a signal that freight demand is weakening heading into the second half of the year.

Peak season in air freight — typically the stretch from late autumn into year-end when retailers stock shelves and e-commerce volumes surge — is the industry's most reliable demand indicator. When it underdelivers, carriers, lessors and freight forwarders recalibrate capacity plans for the months that follow.

The current season fits that pattern. Activity that would normally tighten capacity and lift rates has instead remained subdued, according to reporting on the sector. For cargo operators, a flat peak removes the seasonal rate spikes that underwrite annual profitability, and it pressures the economics of freighter conversions and dedicated cargo capacity.

What does a weak peak season mean for capacity?

A muted peak has direct consequences across the supply chain:

• Carriers hold off on adding temporary freighter capacity or reactivating parked aircraft.
• Freight forwarders face thinner margins without peak-season rate volatility to trade on.
• Lessors and conversion shops see softer demand for narrowbody freighter programs if the outlook stays weak.
• Shippers gain negotiating leverage on rates heading into the new year.

Is the second half at risk?

The signal matters because peak-season strength usually carries momentum into the first quarter through restocking cycles. A quiet peak suggests the opposite: inventory levels may already be adequate, or demand itself is softening, either of which suppresses air cargo volumes in the months ahead.

For an industry that spent the past several years managing capacity swings — from the pandemic-era cargo boom to the belly-capacity recovery in passenger networks — a weak peak strips away the margin cushion operators had budgeted for. Airlines that leaned on cargo revenue to offset passenger-network costs will feel the gap most directly.

Watch the rate indices and freighter utilization data through the end of the quarter: if the seasonal uptick fails to materialize, expect carriers to trim freighter schedules and defer conversion decisions into next year.