The aircraft is already flying
Because the passenger service covers much of the basic operation, selling unused hold capacity can generate incremental revenue without scheduling another aircraft.
Modern wide-bodies use standardized containers
Unit load devices allow baggage and freight to be prepared before the aircraft arrives, then loaded efficiently into the lower deck. Smaller aircraft may use bulk loading instead.
Not every shipment can travel this way
Large dimensions, dangerous goods restrictions, temperature needs or security rules can make dedicated freighter service more appropriate. Passenger aircraft also have limited main-door and hold dimensions.
Baggage gets priority in practical planning
Airlines must accommodate passenger bags and maintain safe weight and balance. Commercial cargo may be reduced or offloaded if payload limits tighten because of weather, runway performance or unusually heavy passenger loads.
Long-haul routes can be especially valuable for freight
Wide-body aircraft offer substantial lower-deck volume and connect major economic centers nonstop. The same route can therefore serve both passenger demand and high-value international trade.
Cargo helps explain why route economics are complex
A flight that appears weak when judged only by passenger fares may perform better once freight revenue is included. Airlines evaluate the combined contribution of passengers, baggage products and cargo.
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