Air cargo, commonly known as air freight, is collected by firms from shippers and delivered to customers. Aircraft were first used for carrying mail as cargo in 1911. Eventually manufacturers started designing aircraft for other types of freight as well.
A consumer is  a person or organization that uses economic services or commodities. In economic systems consumers are utilities expressed in the decision to trade or not.
A primary consumer is an organism that consumes producers (typically plants) directly. It does not consume any other consumers. Terms of the food chain: producer-a living câ¦reature that makes food and energy by itself through a process called photosynthesis.