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.
The dictionary defines a consumer as 'one who acquires goods and services.' While this explanation is more of a description for how people buy and use products, it also relates to the animal kingdom. Consumers are those organisms that eat other things. They may eat plants or they may eat animals.