Which mode of shipment involves air transportation for small packages?

The choice of air small package carrier is correct because it specifically refers to a mode of shipment that primarily utilizes air transportation for the conveyance of smaller parcels. This mode is characterized by its efficiency and speed, making it an ideal choice for time-sensitive deliveries.

Air small package carriers offer specialized services that cater to the needs of businesses and individuals looking to ship packages quickly over long distances. These services typically include tracking options and door-to-door delivery, which enhance the overall shipping experience.

Other shipment modes such as Seavan, local delivery, and motor truckload do not focus on air transport for smaller packages. Seavan typically involves ocean freight for containers, local delivery refers to transport within a confined geographical area often using ground vehicles, and motor truckload requires larger freight shipments. Thus, air small package carrier distinctly suits the context of air transport for small packages.