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.
The lower hold would otherwise fly partly empty
Passenger baggage does not fill every available position on every flight. Airlines can sell remaining hold capacity to freight customers, generating revenue from space that is already traveling to the destination.
Wide-body routes are especially important for belly freight
Long-haul passenger aircraft can carry substantial cargo beneath the cabin after baggage is loaded. When passenger services are reduced, freight markets can lose capacity even if dedicated cargo airlines continue operating.
Cargo can influence route economics without passengers noticing
Revenue from mail, pharmaceuticals, electronics or perishables can improve the economics of a passenger route. On some city pairs the freight market is strategically important enough to influence schedule frequency or aircraft choice.
Not every shipment is suitable for a passenger aircraft
Hold dimensions, dangerous-goods rules, temperature needs and passenger-baggage priority all limit what can be accepted. Oversize freight and certain specialized loads move on dedicated freighters instead.
Cargo loading is coordinated with passenger baggage and aircraft balance
Freight cannot simply fill every empty corner. Containers and bags are assigned positions so the aircraft remains within weight-and-balance limits, and late baggage changes can affect the final load. Cargo planning is integrated with the passenger flight rather than performed as a separate afterthought.
Perishable freight benefits from frequent passenger schedules
Flowers, seafood, fruit and pharmaceuticals can move quickly when a city pair has several daily passenger flights. The shipper gains more departure options than a dedicated freighter network might offer. This is one reason major passenger hubs are also important cargo gateways.
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