A master air waybill (MAWB) is the airline's contract for a whole consolidated shipment, usually between two forwarders. A house air waybill (HAWB) is the forwarder's own document for one customer's goods inside that consolidation, linked to the MAWB number.
Key takeaways
- The airline issues the MAWB (an 11-digit number); the forwarder issues the HAWB (its own reference format) to each shipper.
- One MAWB can cover many HAWBs, which is how forwarders pool small shipments into cheaper bulk space.
- Shippers using a forwarder usually track with the HAWB on the forwarder's portal; the airline tracks the MAWB.
- In electronic messaging, IATA standards carry master data in the FWB message and house data in the FHL message.
- Customs filings increasingly need house-level detail, so a vague HAWB goods description can delay the whole consolidation.
What is the difference between a HAWB and a MAWB?
A master air waybill (MAWB) is issued by the airline or its agent for the whole consolidated load; a house air waybill (HAWB) is issued by a freight forwarder to each of its customers for their individual goods.
The easiest way to picture it is as two layers. The top layer is the airline's contract: it names the forwarder at origin as shipper and the forwarder or agent at destination as consignee, and it lists total pieces, weight and charges for everything on the pallet or container. The lower layer is the forwarder's contract with you: it names the real seller and the real buyer, describes only your goods and carries your own references.
If you have never seen an air waybill, start with our guide to how an air waybill works. This article picks up where that one stops and explains why the second layer exists and what it means for you.
Why do forwarders issue house air waybills?
Because forwarders consolidate: they gather cargo from many shippers, tender it to the airline as one booking and split it again at destination.
The airline sees one customer and one master document. Each shipper, however, needs a document that reflects its own goods, its own consignee and its own charges. The HAWB fills that gap. It also lets the forwarder control the relationship with the customer: it bills you on the house document under its own terms, while the airline bills the forwarder on the master.
The commercial logic is simple. Forwarders buy space in volume and resell it in smaller pieces, so a shipper with 80 kg can benefit from a bulk arrangement it could not negotiate alone. Your chargeable weight is still what determines your share of the cost; the HAWB is the document that records it.
How do the two documents compare side by side?
They differ in who issues them, who is named on them, what they cover and how they are numbered.
| Master AWB (MAWB) | House AWB (HAWB) | |
|---|---|---|
| Issued by | The airline or its agent | The freight forwarder |
| Contract between | Forwarder and airline | Forwarder and its customer |
| Shipper and consignee shown | Usually the origin and destination forwarders (or their agents) | The actual seller and buyer |
| Cargo covered | The whole consolidation | One customer's goods |
| Number format | 11 digits: 3-digit airline prefix, 8-digit serial | Forwarder's own reference, often with letters |
| Who tracks with it | Airline, handler, forwarder | The shipper and consignee, on the forwarder's portal |
| Electronic message (IATA) | FWB | FHL |
One caution on the last row: the message names come from IATA's Cargo-IMP standard, with Cargo-XML equivalents. Version numbers change over time, so your forwarder's system provider will confirm which version applies on your lane.
How do the MAWB and HAWB link together?
Each house waybill is tied to its master by the MAWB number, which is how airlines, customs and forwarders connect the two layers.
In IATA's e-AWB standard operating procedures, the forwarder sends the master data in an FWB message and, where a consolidation applies, the house data in FHL messages. The procedures also ask that each house record carry its own security status, so screening information follows the individual consignment and not just the consolidation as a whole. For the technical background, IATA publishes its Cargo-XML Toolkit, which covers the newer XML versions of these messages and their mapping to the older format.
IATA's longer-term direction is ONE Record, a data-sharing standard in which each shipment is a single linked data record that every party can read, rather than a chain of separate messages. It is not yet universal, so for now the MAWB-HAWB pairing remains how most consolidated cargo is documented.
Which number should you use to track a shipment?
Use whichever number you were given by the party you contracted with, and ask for the other one.
- Shipped through a forwarder: your HAWB or booking reference works on the forwarder's portal. Ask for the MAWB number as well, because it lets you check flight status directly on the airline's site.
- Booked directly with an airline: you have a MAWB only. The 3-digit prefix tells you which airline's tracking page to use.
- Cargo not moving? Quote both numbers when you contact anyone. The forwarder can match them instantly; the airline will only recognize the master.
Our step-by-step guide to tracking an air waybill (AWB) number shows how to read airline status codes once you have the MAWB.
Why do customs rules make the HAWB matter more?
Because security and customs systems increasingly ask for data at house level, not just for the consolidation.
The clearest example is the European Union's Import Control System 2 (ICS2). According to a note to operators from French Customs, the airline is responsible for lodging the entry summary declaration, and it may allow house filers such as forwarders to file directly. Guidance summarized from EU sources adds that the party issuing the house air waybill must declare the master air waybill number it flies under, and the carrier must declare the house-level filer's EORI number in its own master filing. The European Commission has also stated that goods with different HS codes must be declared separately at house level and that descriptions such as "unknown" are not acceptable. Check your airline's and forwarder's current instructions for deadlines and filing routes, as these differ by carrier and country.
The practical lesson for shippers: the goods description, consignee address and any importer identifiers you give your forwarder end up on the HAWB, and from there in government risk-screening systems. A vague description is not a harmless shortcut; it can hold your cargo and, in a consolidation, complicate the whole load.
What should shippers check on a house air waybill?
Check the same fields you would on any waybill, plus the link to the master.
- Parties: your legal name and address as shipper, and the exact consignee name, address and contact details.
- Goods description: specific enough for customs to understand what the product is, what it is made of and what it is for.
- Pieces and weights: they must match the packing list and invoice, and the pieces you actually hand over.
- Charges: prepaid or collect, and any declared value for carriage if you want liability above the standard limit.
- Special handling: dangerous goods, temperature control or valuable cargo must be declared on the booking, not discovered at the terminal. Our guide to dangerous goods classes explains what needs declaring.
- The MAWB reference: once the flight is booked, confirm the master number so you can follow the airline leg yourself.
When does it make sense to ship with a MAWB directly?
When you move enough cargo on a regular lane to book with an airline or general sales agent yourself, and you have the staff to handle customs, screening and documentation.
For most small and mid-size shippers, using a forwarder and receiving a HAWB is simpler. The forwarder handles the master booking, and you deal with one party. If you are still weighing speed against cost for a lane, our air freight vs sea freight comparison sets out the trade-offs. Jumbo Air Cargo's JumboGeneral service is built around general air cargo moves of this kind.
Frequently asked questions
Can a shipment have a HAWB but no MAWB?
No. A house air waybill only exists inside a consolidation that flies under a master air waybill. A shipper who books directly with an airline gets a MAWB only.
Which number do I use to track my cargo?
If you booked through a forwarder, start with the HAWB or the reference the forwarder gave you. If you have the MAWB number, the airline's cargo tracking page will show the flight-level status.
Is a house air waybill a legal contract?
Yes, between the forwarder and its customer. It follows the forwarder's own terms, while the MAWB is the contract between the forwarder and the airline.
Why does my forwarder ask for exact goods descriptions?
Customs systems, including the EU's ICS2, need house-level data. Vague wording such as "parts" or "unknown" can trigger a hold that affects the shipment.
