A pneumatic compressed-air tube transport system and a method for transporting small assembly parts to assembly and processing lines for assembly of products. The transport system includes at least one drop-off branch configured to drop off the small assembly parts into the compressed-air tube transport system. The at least one drop branch includes at least one air flow generator, a butterfly valve located downstream of the air flow generator, and a drop-off station for the small assembly parts located downstream of the butterfly valve. The small assembly parts move through a tube into at least one joining switch and a plurality of delivery stations are configured to receive the small assembly parts.