Main-deck cargo changes the aircraft interior
Instead of passenger seats, freighters use roller systems and restraint locks for pallets and containers. Structural floors are designed for concentrated loads that a normal passenger cabin would not accept.
Large cargo doors are a defining feature
Side cargo doors permit standard pallets to enter the main deck. Some freighters also offer nose-loading capability, useful for very long or awkward items that cannot turn through a side door.
Payload and volume are separate constraints
A shipment can fill the aircraft before reaching maximum weight, or reach the weight limit while leaving unused space. Cargo planners care about both density and dimensions.
Range changes with payload
A freighter carrying a very heavy load may not be able to fly as far nonstop as it could with a lighter shipment. Operators balance fuel, cargo and route distance just as passenger airlines balance payload.
Converted freighters extend aircraft life
Passenger aircraft can be modified with cargo doors, floor reinforcement and other systems after leaving airline passenger fleets. Conversion is a major engineering project, not a simple removal of seats.
Different networks favor different aircraft
Express carriers value frequent, reliable movement through sorting hubs, while heavy-cargo operators may need unusual loading capability. There is no single ideal freighter for every logistics mission.
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