Cargo Load Factor

Cargo load factor is the ratio of actual freight uplifted to the available freight capacity on an aircraft or across a network, expressed as a percentage. It is the freight equivalent of the passenger load factor and serves as the primary efficiency measure in air cargo operations, indicating how effectively an airline is filling its available cargo space.

What Is Cargo Load Factor?

The calculation is straightforward: cargo load factor equals revenue cargo tonnes carried divided by available cargo tonne capacity, multiplied by 100. Available capacity is the structural payload limit of the aircraft after accounting for the weight of fuel and the estimated weight of passengers and their bags. A wide-body aircraft with 25 tonnes of belly capacity carrying 20 tonnes of cargo has a cargo load factor of 80 percent. Airlines track load factor at the flight level, the route level, the hub level, and the network level. They also track a volume-based load factor — cubic meters used versus cubic meters available — because lightweight, bulky goods (known as volume cargo) may fill available space before reaching the weight limit.

How It Works in Practice

Revenue management and cargo operations teams monitor load factors in real time. If load factor on an upcoming flight is running low, the cargo team may lower spot rates to stimulate demand or release previously blocked capacity to the spot market. If load factor is running high — a sold-out flight — the team may increase spot rates and evaluate whether to upgrade to a larger aircraft or add a freighter to the lane. Airlines measure load factor against breakeven targets: the cargo load factor at which freight revenue covers the marginal cost of carrying that cargo (primarily handling and fuel burn). Any load factor above breakeven generates incremental profit on belly cargo.

Why It Matters

High cargo load factors are associated with tight capacity markets, strong demand, and premium pricing power. Industry-wide cargo load factors above 60 percent historically correlate with rising yields and carrier profitability. Load factors that persistently fall below 50 percent signal overcapacity, typically leading to rate pressure and potential route rationalization. The measurement also guides fleet and network strategy: if a route consistently runs high cargo load factors, it signals an opportunity to upgrade to a larger aircraft or introduce a dedicated freighter. Post-pandemic, global cargo load factors normalized from pandemic peaks of over 70 percent toward long-run averages of 45 to 55 percent as belly capacity returned to the market.

Key Facts and Figures

• Global air cargo load factors averaged approximately 45 to 50 percent in normal pre-pandemic years
• Load factors peaked at over 70 percent in early 2021 as belly capacity remained severely constrained and demand surged
• Volume cargo (ULDs reaching volume limit before weight limit) is most common in markets shipping e-commerce and light consumer goods; weight cargo dominates on lanes carrying industrial parts and metals
• Revenue tonne-kilometers (RTK) and available tonne-kilometers (ATK) are the IATA-standard units used to compute network-level load factors
• A one-percentage-point improvement in industry cargo load factor is estimated to generate several hundred million dollars in additional industry revenue annually

Related Concepts

Cargo Revenue, Belly Freight, Freighter Aircraft, Unit Load Device, Cargo Hub