K. Somsak Chaivichit
Head of Marine & Cargo Insurance
18 years structuring marine cargo and trade insurance programs for exporters, importers, and freight forwarders across ASEAN and beyond.
Short answer
Air freight moves goods by aircraft under an air waybill (AWB), priced on chargeable weight — the greater of actual and volumetric weight at 1 kg per 6,000 cm³. Transit takes 2–5 days door-to-door on major lanes versus weeks by sea. Air suits high-value, low-weight, or time-critical cargo where inventory carrying costs, market windows, or shelf life outweigh freight premiums of roughly 4–6× ocean rates.
Chargeable Weight: Air Freight's Pricing Core
Aircraft capacity is constrained by both weight and volume, so air freight prices whichever is greater: actual gross weight, or volumetric weight calculated as length × width × height ÷ 6,000 (in centimeters and kilograms). A 10 kg carton measuring 60×50×40 cm has volumetric weight of 20 kg — and pays for 20.
The Air Waybill
The air waybill is air freight's bill of lading — with one decisive difference: it is not a document of title. The AWB is a receipt and carriage contract, but goods are deliverable to the named consignee without AWB possession. This makes air shipments faster to release but removes the title-control mechanism that LC and collection structures depend on.
- Master AWB (MAWB) — issued by the airline to the freight forwarder
- House AWB (HAWB) — issued by the forwarder to the actual shipper, consolidating multiple shipments
- AWB as customs document — serves as the import declaration transport document in most jurisdictions
- Payment terms coded on the AWB — prepaid or collect, determining who settles freight
Because the AWB doesn't control title, air shipments under LC require care: credits often stipulate AWBs consigned to the issuing bank to preserve control. Sellers shipping air on open account should recognize that the buyer collects goods on arrival — payment security must come from elsewhere (advance, insurance, escrow).
What Drives Air Freight Cost
- Chargeable weight at the applicable rate break — rates fall at 45 kg, 100 kg, 300 kg, 500 kg, and 1,000 kg thresholds
- Origin-destination pair and trade lane balance — backhaul lanes price dramatically cheaper
- Fuel and security surcharges — volatile components quoted separately from base rates
- Speed of service — express integrators (door-to-door in 2–3 days) versus standard air cargo (4–7 days)
- Special handling — temperature control, dangerous goods, live animals, high-value security cargo
- Terminal handling, pickup, and delivery at both ends
The Air vs. Ocean Decision
| Factor | Air | Ocean |
|---|---|---|
| Transit | 2–5 days door-to-door | 20–40 days door-to-door |
| Freight cost | Roughly 4–6× ocean per kg | Baseline |
| Inventory carrying cost | 3–4 weeks less capital tied up | Capital locked for full transit |
| Packaging | Lighter packaging often acceptable | Seaworthy packing required |
| Insurance premium | Lower exposure window | Longer exposure window |
| Reliability | High schedule adherence | 50–80% on-time performance |
The decision framework: compare total landed cost including freight, insurance, packaging, and — critically — the cost of capital tied up in goods during the transit differential. For goods above roughly $50–100 per kilogram of value density, air frequently wins on total cost despite the freight premium. Below that, ocean dominates unless market windows or shelf life force speed.
Security and Compliance Requirements
- Known consignor or regulated agent status for shippers in many jurisdictions
- Security screening of all cargo on passenger aircraft; RA3/KC3 validation for EU-bound freight
- Dangerous goods declaration and packing per IATA DGR — lithium batteries the most common violation
- Prior electronic data requirements (e.g., US ACAS, EU ICS2) before loading
- Restricted and prohibited items screening — counterfeits, CITES species, dual-use goods
Air cargo security compliance is non-negotiable and personal: shippers face direct liability for misdeclared dangerous goods, and carriers will refuse or destroy non-compliant shipments at shipper cost. Lithium battery incidents have made this the most actively enforced area of air cargo regulation.
Key takeaways
- Air freight prices chargeable weight — actual or volumetric (÷6,000), whichever is greater.
- The AWB is not a document of title: goods release to the named consignee without it.
- Rate breaks at weight thresholds reward consolidation; packaging design directly drives cost.
- Air wins above ~$50–100/kg value density when carrying costs enter the comparison.
- Security screening and dangerous goods compliance are shipper liabilities, not carrier formalities.
Frequently asked questions
Door-to-door in 2–5 days on major lanes versus 20–40 by ocean — a 3–4 week compression. Express integrators achieve 1–3 days on dense trade lanes at premium rates.
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