How the air document layer works
The structure mirrors ocean freight: the airline issues one MAWB to the forwarder, and the forwarder issues a HAWB to each customer whose cargo rides in that consolidation. The MAWB number is immutable once issued and follows a fixed format — a 3-digit airline prefix (e.g., 176 for Emirates) plus an 8-digit serial where the last digit is a modulo-7 check digit. TMS and quoting systems validate this checksum; a mistyped AWB fails it.
Because an AWB is a contract of carriage and cargo receipt but not a document of title, there is no original-surrender or telex-release process in air freight. The destination handler releases cargo to the consignee named on the waybill against identification — one reason air freight documentation moves faster than ocean.
What differs from ocean — and what it means for the desk
Liability on the HAWB sits with the forwarder as contracting carrier under the Montreal Convention's limits, with recovery against the airline under the MAWB. Rating happens on chargeable weight (the greater of gross and volumetric weight), and the buy/sell spread between MAWB rating and HAWB rating is the consolidator's margin — the whole economics of air consolidation is arbitraging weight breaks across the two documents.