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.
Consumers are the organisms that cannot make their own food from inorganic compounds. The consumers are dependent on autotrophic organisms or producers or other primary consumer or heterotrophic organisms in an ecosystem. The consumers are subdivided into herbivores, carnivores and omnivores according to their diet.