“Baggage build” is the final step where checked bags are loaded onto the correct airplane. Its purpose is to complete the journey: each bag must be placed in the hold of the flight that matches its tag. A good build process ensures efficiency and accuracy, preventing misloaded bags and delays.
Think of the plane’s cargo hold as a puzzle: handlers must fit all luggage safely, balancing weight and volume. They sort bags by destination and make sure fragile or priority items (e.g., a wheelchair or oversize) are placed accessibly. The build process also re-verifies identity: usually, one crew member checks that the bag tags match the aircraft and that no unauthorized items are loaded.
From a customer’s view, a solid build process means your bag will arrive under the plane in the same condition you dropped it. Any error here – like putting a bag in the wrong cargo door – can cause it to arrive at a different airport. So the purpose of baggage build is quality control at the last step, and making sure all bags actually depart on the plane with you.