Air freight is the transport of goods by aircraft, either in a scheduled airliner or chartered airliner carrying passengers (an all-traffic service) or in a freight plane (an all-freight service) . Air cargo usually consists of goods that have a high value compared to their weight. Found on http://www.probertencyclopaedia.com/browse/JA.HTM
a system of transporting freight by aircraft: Ship it by air freight. · freight transported by aircraft. · the charge for such transportation. Found on https://www.infoplease.com/dictionary/air-freight