The container your cargo arrives in is not part of the shipment. It belongs to the airline or to a leasing company, it is on loan, and there is a clock running on it.
Most shippers find this out when an invoice appears. This page covers who owns the equipment, how long you can hold it, what it costs when you do not return it, and what happens if it goes missing.
Who Owns the ULD Your Cargo Travels In?
The airline, or a leasing company the airline rents from. Never the shipper and never the forwarder, whatever the cargo inside it is worth. A ULD is a removable aircraft part on loan, not packaging that comes with the freight.
The global fleet runs to roughly 900,000 units. Airlines own a share outright and lease the rest from specialist operators who also handle repair, positioning and tracking.
That distinction is the whole page. Everything that follows comes from the fact that the equipment is lent rather than sold.
Why Do Airlines Lease ULDs Instead of Buying Them?
Because the fleet an airline needs is far larger than the number of units flying at any moment, and the surplus is expensive to own, repair and store.
Airlines provision roughly seven to eleven sets of pallets for every load position on an aircraft. The rest of the fleet is in transit, in repair, positioned at outstations, or waiting to be returned.
Leasing moves the cost of that surplus onto a specialist and converts it from capital into an operating cost. It also moves the repair network, the certification tracking and the positioning logistics across with it, which are the parts an airline gains least from doing itself.
The equipment works hard. A standard pallet makes around a hundred trips a year, against roughly five for an ocean container. That turnover is why availability matters so much and why the industry cares about units that stop moving.
What Happens When a ULD Leaves the Airport?
It passes into someone’s custody under a receipt, and that party becomes responsible for returning it in serviceable condition. The transfer is recorded on a ULD Control Receipt, which is the document that establishes who is holding the unit.
From that point the holder carries three obligations.
- Return it on time, at their own cost, to the carrier’s nearest representation point
- Return it clean and serviceable, or pay for cleaning and repair
- Pay demurrage for every day beyond the free period
Up to a tenth of an airline’s ULD inventory can be sitting off-airport and unavailable at any time. That is the problem demurrage exists to manage.
For what the markings on the unit tell you about whose asset it is, see ULD codes explained. The last two characters of the code are the owner code, and they identify who will be invoicing you.
What Is ULD Demurrage?
Demurrage is a daily charge applied when a ULD is held beyond its free period. It exists to get equipment back into circulation rather than to earn money. IATA’s TACT manual describes the charge as “designed to encourage prompt return of ULDs rather than generate revenue.”
The free period is five days in most published terms, both for transfers between airlines and under carrier terms for off-airport users.
Three details in the published terms catch people out.
- Weekends and public holidays count. The clock does not pause
- Part days are charged as full days. Returning on the morning of day seven costs the same as returning that evening
- The clock starts at release, not at delivery. It runs from 00:01 on the day the unit is released to you
Enforcement has historically been inconsistent. Airlines bill each other routinely through the industry clearing system, but have been reluctant to bill forwarders and shippers for fear of losing them to a competitor who does not. That is changing as equipment availability tightens, so a charge that was waived two years ago is not safe to assume now.
How Much Does ULD Demurrage Cost?
Rates are set per unit type and published by each carrier in its ULD terms. They vary widely, because a simple pallet and a specialist container are not comparable assets.
One carrier’s published tariff gives the following daily rates.
| Unit type | Daily demurrage |
|---|---|
| Aircraft pallet with net (PAG) | €8.12 |
| Pallet type PGF | €53.45 |
| Container type AMD | €81.00 |
Those figures are from a single carrier’s published terms and are shown to indicate the scale rather than as a universal rate. Check the terms of the carrier you are shipping with, which are usually published openly as a PDF on their site.
The pattern matters more than the numbers. A basic pallet held for a week costs little. A specialist container held for the same week costs roughly ten times as much, and the units most likely to be held longest are often the specialist ones, because the cargo inside them takes longer to unload and process.
A thermal container sitting at a pharmaceutical facility while the consignment is inspected is the common example. See temperature controlled air freight for why those units stay in place longer.
What Happens If a ULD Is Lost or Damaged?
A unit not returned within 180 days is treated as lost, and the holder pays its full replacement value. The same applies to a unit damaged beyond economical repair, abandoned, or seized by legal process.
Replacement values are published alongside the demurrage rates and are considerably larger.
| Unit type | Replacement value |
|---|---|
| Aircraft pallet (PAG) | €1,461 |
| Pallet type PGF | €9,620 |
| Container type AMD | €14,581 |
| Specialist container (HMC) | €45,000 |
Again, one carrier’s published figures, indicative rather than universal.
Two points are worth knowing. If a unit written off as lost is later recovered, the carrier credits the replacement charge back, less whatever repair is needed to return it to service. And damage short of a write-off is charged as repair cost rather than replacement, with the holder liable for damage occurring during their possession.
The practical risk is not the unit that disappears. It is the unit that sits in a corner of a warehouse for six months because nobody knew it had to go back.
How Are ULDs Tracked?
Through a mix of scanning at handling points and electronic tags fitted to the units themselves. Barcode and RFID scanning at terminals has been standard for years. Bluetooth and cellular tags that report position and condition continuously are now widespread across leased fleets.
Modern tags do more than report location. They record temperature, shock and door openings, which turns the container into a data source about the cargo as well as the asset.
For a shipper this changes two things. The owner knows where the unit is, so a late return is visible rather than something that surfaces at an audit months later. And on temperature-controlled consignments, the tag produces an independent record of conditions in transit, which is useful evidence when a claim is disputed.
The tracking is of the equipment rather than your consignment. Cargo tracking runs on the air waybill number and is a separate system, as covered in air cargo handling.
Why Does Any of This Matter to a Shipper?
Because accepting delivery in a ULD means taking custody of an asset that is not yours, with a clock on it and a five-figure liability behind it.
Three situations create most of the exposure.
- Delivery to your own premises in the unit. Convenient for unloading, and it starts the clock the moment the unit is released
- A consignment held for inspection. Customs examination or quality hold keeps the cargo in the unit, and the free period runs regardless
- A unit left behind after unloading. The commonest and most avoidable. Nobody arranges the return because nobody knew they had to
The amounts are small against the value of most air freight consignments, which is exactly why they go unnoticed until several of them accumulate. A forwarder absorbing these charges across a client base is carrying a cost that eventually appears in air freight rates.
How Do You Avoid ULD Charges?
Unload at the airport and let the unit stay there. That removes the exposure completely and is the right answer for most shipments.
Where the unit does travel to your premises, four things keep the cost down.
- Ask who owns the unit and what the free period is, before it leaves the airport rather than after
- Get the return logistics agreed in advance, including who pays, because the holder pays return costs under most published terms
- Unload and release the same day where possible, since part days count as full days
- Record the release date, because the clock starts then and that is the date any dispute turns on
If a consignment is likely to sit under inspection, raise it at booking. Your forwarder can often arrange deconsolidation at the terminal so the cargo moves on and the unit stays put. A freight forwarder that handles this without being asked is worth keeping.
For the wider picture on what ULDs are and how the equipment works, see ULD air cargo containers.
Questions About ULD Leasing and Demurrage
Who owns air cargo containers?
The airline, or a leasing company the airline rents from. A ULD is a removable aircraft part on loan rather than packaging supplied with the shipment, so it is never the property of the shipper or the forwarder.
How long can you keep a ULD before charges start?
Five days under most published terms, counted from the day the unit is released. Weekends and public holidays are included, and part days are charged as full days.
How much is ULD demurrage per day?
It depends on the unit and the carrier. One carrier’s published tariff runs from about €8 a day for a basic pallet to about €81 a day for a specialist container. Check the terms of the carrier you are shipping with.
What happens if a ULD is lost?
A unit not returned within 180 days is treated as lost and the holder pays the full replacement value, which published tariffs put between roughly €1,500 and €45,000 depending on type. If it is later recovered, the charge is credited back less any repair cost.
Why do airlines lease ULDs rather than own them?
Because the fleet needed is much larger than the number of units flying at once. Airlines hold seven to eleven sets of pallets per load position, and leasing moves the cost of that surplus, along with the repair and positioning network, onto a specialist.
Are ULDs tracked?
Yes. Scanning at handling points has been standard for years, and Bluetooth and cellular tags reporting position, temperature and shock are now common across leased fleets.
