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.
primary consumer - a consumer that gets energy from eating plants; typically a herbivore secondary consumer - a consumer that gets energy from eating primary consumers; a carnivore tertiary consumer - a high level consumer, which is usually the top predator in the ecosystem and/or food chain.