Air Cargo Booking Status Codes, Offloading and Next Flight Out Explained

An air cargo booking is a reservation of space on a named flight, and "offloading" is what happens when cargo that the airline has already accepted is not loaded on that flight and has to travel on a later one. The key point for shippers: a confirmed booking is the airline's commitment to try to carry the cargo, but the air waybill's conditions of contract do not guarantee flight times, and cargo only has a real place on the aircraft once it has been physically accepted, built up and manifested. This guide walks through the booking life-cycle, the tracking events you will see, why cargo is bumped, what a delay claim can recover, and what "next flight out" services are. For the paperwork side, see our guide to the air waybill (AWB), master and house.

How an air cargo booking works, step by step

The sequence below is the usual convention between a forwarder (or shipper) and an airline. Exact names and systems vary by airline, handler and forwarder software.

1. Booking request. The forwarder asks the airline (or its general sales agent) for space on a flight, giving origin, destination, pieces, weight, volume and commodity. Special cargo such as dangerous goods, live animals or temperature-controlled freight is normally declared at this stage because the airline has to check it can take it.
2. Airline response. The airline confirms, confirms on a different flight, puts the request on a waiting list, or declines. IATA's Cargo-XML standard has separate booking request (XFFR) and booking confirmation (XFFA) messages for this exchange, as shown in IATA's own message diagrams.
3. Delivery to the airline or its handler. The cargo, labelled and with the AWB data transmitted, goes to the airline's cargo terminal or ground handler before the acceptance deadline for that flight.
4. Acceptance. The handler checks weight, dimensions, packaging, labels and documents. When the cargo passes, it is accepted as ready for carriage.
5. Build-up and manifesting. The cargo is loaded into a unit load device or onto a pallet, weighed and assigned to the flight. See our reference on air freight ULD types for what the units look like.
6. Departure, arrival, availability and delivery. The flight leaves, lands, the cargo is received into the destination warehouse, the consignee or agent is notified, and the cargo is handed over after customs release.

What do the booking status codes mean (KK, HK, HN, NN, UN)?

Airline reservation systems use short two-letter status codes. In practice, forwarders see KK or HK used to mean a confirmed booking, and codes in the HN, NN and UN family used for requested, needs-action or unable states, including waitlist-style outcomes. We could not find an IATA public page that publishes the cargo booking code table, so treat this as industry convention: the same code can be worded differently by different airlines and systems, and the airline's booking confirmation (or your forwarder's system) is the only authoritative statement of what you actually hold.

• Confirmed (usually shown as KK or HK). Space is allocated on a stated flight, normally subject to the airline's acceptance deadline and to the details you declared being accurate.
• Waitlisted or requested (usually in the HN, NN, UN family). The airline has not committed space. Do not tell your customer the cargo is booked.
• Confirmed on different terms. The airline offers another flight or date. Check that the change still meets the customer's delivery requirement before accepting.

A common misconception is that a confirmed booking is a guaranteed seat. It is closer to an allocation, and the weight and volume actually presented at the terminal can differ from what was booked.

Acceptance deadlines and when cargo is really "on the flight"

Every flight has a latest acceptance time: the deadline to deliver cargo to the airline's terminal so it can be checked, screened and built up. Airlines and handlers publish these, and they differ by airport, by product and by cargo type (general cargo, perishables and dangerous goods usually have separate cut-offs). Missing it can lose the booked space even though the booking was confirmed. Some terminals also quote a "time of availability" on arrival, meaning when cargo can be collected; that is a local handler term, not a fixed standard, so ask the handler how it is defined. The ocean equivalent of these deadlines is covered in our guide to shipping cut-off times; air cut-offs work on the same logic but are measured in hours rather than days.

How to read air cargo tracking events (RCS, MAN, DEP, ARR, RCF, NFD, DLV)

Airlines, handlers and forwarders send each other freight status update (FSU) messages. In IATA's current format, Cargo-XML, this is the XFSU message; an older Cargo-IMP version is called FSU, and IATA's own e-AWB materials state that status codes are the same in both formats. The table gives the common events. Wording for RCS, DEP, ARR, RCF and DLV comes from IATA and UPU material; MAN and NFD wording comes from a handler procedure and vendor documentation, so confirm exact definitions in the airline's tracking notes.

Two practical reading rules. First, a DEP event does not prove your pieces were on that flight: the more reliable evidence is a MAN event for your AWB on the same flight followed by RCF at the other end. Second, tracking updates are milestones, not live location. IATA and the carriers describe air cargo tracking as relying on periodic status messages, so a gap between events is normal. For a contrast with ocean, see container tracking explained, where the container number gives you a different kind of visibility.

What does "offloaded" mean, and why does confirmed cargo get bumped?

Cargo is offloaded (also called bumped or shut out) when it was accepted or booked for a flight but is not carried on it. Typical reasons, in general terms, are:

• Weight and balance. The aircraft has a maximum take-off weight and a balance limit. If fuel, passengers, baggage and cargo together exceed it, something comes off.
• Volume or contour limits. Cargo that fits by weight may not fit the available positions, especially in the belly of a passenger aircraft (see belly cargo versus freighter capacity).
• Higher-priority loads. Mail, special handling cargo or time-critical products may be loaded ahead of general cargo.
• Special cargo. Positions for dangerous goods, live animals or temperature-controlled freight are limited, and cargo that fails a last-minute document or packaging check can be refused for that flight.
• Booked weight not matching actual weight. A shipment heavier or bulkier than booked has a weaker claim on the reserved space.
• Aircraft change, delay or cancellation. A smaller aircraft or a cancelled flight reduces the capacity that was sold.

The order in which an airline offloads cargo is set by that airline. We could not confirm a single public IATA offload-priority ranking, and the airline conditions of carriage we found describe broad discretion rather than a fixed list. Some carriers say cargo moves in the priority of the product the shipper bought, within operational limits. Do not assume a given commodity or rate class is protected; ask the airline or handler for its published conditions of carriage and its offload practice. We do not quote offload rates here because we found no authoritative published figure.

What can you do if cargo is offloaded, and what does the carrier owe?

The air waybill is the contract, and its conditions matter more than the booking confirmation. IATA's standard air waybill conditions of contract (Resolution 600b) say the carrier undertakes to complete the carriage with reasonable dispatch, may use alternative carriers or aircraft, and may select or change routing. The same conditions make carriage subject to the carrier's conditions of carriage and timetables, but explicitly not the times of departure and arrival stated in them. So flight times on a booking are a plan, not a promise.

If the carriage is international and the Montreal Convention of 1999 applies, the relevant rules are:

• Article 19 (delay). The carrier is liable for damage occasioned by delay in carriage by air of cargo, unless it proves that it and its servants and agents took all measures that could reasonably be required to avoid the damage, or that it was impossible to take such measures.
• Article 22(3) (limit). ICAO's current administrative package states the cargo limit, effective 28 December 2024, as 26 Special Drawing Rights per kilogram for destruction, loss, damage or delay. The older figures were 17 SDR (original) and 22 SDR (from the 2019 review). The shipper can raise the limit by declaring a higher value for carriage and paying any supplementary sum. The limit is a ceiling on proven damage, not a fixed payout.
• Article 31 (notice). For delay, a written complaint must be made within 21 days from the date the cargo was placed at the disposal of the person entitled to delivery. For damage the period is 14 days from receipt. The 21-day delay period appears in both the Convention and the IATA conditions of contract.
• Article 35 (time bar). The right to damages is extinguished if an action is not brought within two years, counted from arrival at destination, from the date the aircraft ought to have arrived, or from the date the carriage stopped.

Three limits are worth stating plainly. First, a late delivery is not automatically compensated: you have to prove actual damage caused by the delay, and the carrier has a defence under Article 19. Second, the Convention applies to international carriage between states bound by it; other carriage can fall under different rules, including the older Warsaw system or national law. Third, a freight charge refund is a commercial matter handled under the tariff and conditions, not an Article 19 remedy. For a plain-English overview of claim limits across modes, see carrier liability limits explained, and consider whether cargo insurance covers delay, since many policies exclude it or cover it only in narrow cases. Check the policy wording.

What is a next flight out (NFO) service?

"Next flight out" is a product name used in the industry, not a single regulated service. It is sold by airlines and by forwarders, usually as an expedited product that tries to put the cargo on the first suitable departure after it is ready, often with higher priority in booking and acceptance. Names vary: some carriers market priority or express products, some forwarders sell "NFO" as a managed service that includes pick-up and tracking. Terms are set by the seller, so read what is included: whether the space is confirmed, what happens if the first flight is full, and what is refunded if it is not met. Priority raises the odds of making the flight; it does not remove the weight-and-balance reasons above.

For very urgent or high-value items, an on-board courier physically accompanies the shipment, a different product with its own cost. See our guide to on-board courier (OBC) and hand-carry shipping. A full charter, covered in air charter versus scheduled air freight, removes the offload risk by buying the aircraft.

Checklist to reduce offload risk

• Book weights and dimensions that match what you will actually present, and rebook if they change.
• Tender the cargo comfortably before the latest acceptance time, not at it.
• Ask the airline or handler for the MAN confirmation on your AWB, not only the booking confirmation.
• Diarise the 21-day delay-complaint and 14-day damage-complaint windows from the delivery date.

What to do next

1. Ask your forwarder which airline and which status they mean by "confirmed", and get the confirmation in writing.
2. Find the latest acceptance time for your flight and your commodity, and work back from it.
3. Track by AWB and look for MAN and RCF, not just DEP.
4. If the cargo is time-critical, price an NFO or priority product, and compare with splitting the shipment or declaring a higher value.

If you need an air freight quote or a forwarder for a particular lane, more than 29,300 logistics companies are searchable by country and service in the CargoLinked directory, and the public requests board lists freight that shippers have posted for forwarders to quote on directly.

This article is general information, not legal, insurance or customs advice. Airline conditions, booking systems and the Montreal Convention's application to a particular shipment vary. Confirm the terms of your air waybill and the carrier's conditions of carriage with the airline, and seek advice from a licensed professional before making or defending a claim. Figures and rules are stated as of October 2026.