Capacity you schedule, capacity you inherit

Freighter capacity is capacity you schedule. Belly capacity is capacity you inherit. That distinction gets lost in the monthly numbers, and right now it's shaping the air cargo market more than the demand line is.

When you run a freighter network, you choose the route, the frequency, and the aircraft — and you can change all three when the market moves. A lane softens, you pull a rotation. A lane tightens, you add one, or you upgauge. The network is an instrument, and the whole discipline of running it well is deciding how to play it week by week.

Belly capacity doesn't work that way. It goes where the passenger network goes, at whatever frequency passenger demand supports, and cargo takes what's left after the bags. No cargo team decides that a passenger route should fly double daily. The capacity simply appears — or doesn't — as a byproduct of decisions made for entirely different commercial reasons.

Right now, belly is the part that's growing. Passenger networks keep expanding, and every widebody that comes with them brings hold space whether the cargo market wants it or not. Freighter capacity, meanwhile, stays constrained: new-generation freighter deliveries are slow, and conversion programmes are short of the passenger airframes they need as feedstock.

So the industry isn't simply adding capacity. It's steadily increasing the share of total capacity that can't respond to cargo economics at all.

That has two consequences worth sitting with.

First, it's part of why rates have held up better than a soft demand year would suggest. In a market where most of the growing capacity can't chase the freight, tightness persists in exactly the places the fixed network doesn't serve. The spot market prices the gap.

Second, it means the tight lanes people keep flagging — intra-Asia, parts of Asia–Europe — don't look like a temporary imbalance that more lift will fix. Those are lanes where the freight wants to go and the passengers don't. Belly growth doesn't help a lane the passenger network has no reason to serve. Only freighters fix that, and freighters are the part of the system that isn't growing.

The practical upshot, if you're planning against this market: capacity headlines are close to useless without splitting them by type. A headline number that blends schedulable and inherited capacity tells you the size of the system. It tells you almost nothing about how the system will behave when demand moves — and how the system behaves when demand moves is the only thing a commercial team actually needs to know.