London Heathrow cargo carried under passenger wings

Cargo that depends on passenger flying

When capacity sits mainly under the passenger cabin, freight availability follows the passenger network: frequent on well-served long-haul routes, thin where aircraft are small, and vulnerable when schedules are reduced. Cargo is also loaded after baggage, so a full passenger flight can leave freight behind even with a booking in place. Shippers with regular volume manage this by spreading consignments across services rather than concentrating them on the most convenient departure, which is a scheduling habit rather than a commercial negotiation.

The trucking network is the feeder

Because freighter services are limited, a substantial amount of cargo reaches or leaves the airport by road under air documentation, connecting with European hubs and British regions. For many shippers the first or last leg of an air movement is therefore a truck, and the transit expectation should reflect it. This also means the practical catchment is much wider than the local area. A consignment originating far from London can still use the network, provided the road leg fits inside the acceptance deadline.

Working within a slot-constrained airport

Runway capacity is tightly allocated, which limits the scope for dedicated freighter operations and makes schedule changes harder to absorb. Ground handling, warehouse space on the estate and truck dock capacity are similarly constrained by the compact site. The practical implication is that timing discipline matters more here than at an airport with room to recover. Late presentation is less likely to be accommodated, and a missed acceptance deadline usually means the next available service rather than a delayed departure.

Specialist sheds and border formalities

Facilities exist for perishables, pharmaceuticals, valuables and live animals, each with defined acceptance procedures and storage conditions. Book cargo into the correct lane at the outset, because these consignments cannot be reassigned at the counter. Import and export formalities follow British requirements, which have changed materially in recent years for goods moving to and from the European Union. Check what applies now with the customs authority or a representative, rather than relying on how a similar consignment was handled previously.

Cargo roles

• Belly-hold carriage on long-haul passenger services
• Import breakdown and delivery for the British market
• Perishable, pharmaceutical and high-value handling
• Consolidation of trucked cargo for onward flights

Frequently asked questions

Why is my freight offloaded when the flight had space?

Belly capacity is shared with passenger baggage, which takes priority, and payload limits vary with fuel, route and conditions. A booking reserves an intention rather than a fixed position on board, so on heavily loaded services freight is the element that can be left for a later flight.

Does trucked cargo count as an air shipment?

Yes, where the road leg is covered by the air waybill itself. Carriers truck consignments between this airport, European hubs and British regions as part of the same contract of carriage, which adds hours that should be reflected in the transit you promise a customer.

How much lead time do special-cargo shipments need?

More than general freight, because they use dedicated acceptance lanes with their own documentation and storage. Perishables, pharmaceuticals, valuables and live animals should be booked into the correct category at the outset, since reclassification at the shed is not usually possible before the cut-off.