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.
As a field of study, consumer behaviour is an applied social science. Consumer behaviour analysis is the use of behaviour principles, usually gained experimentally, to interpret human economic consumption. As a discipline, consumer behaviour stands at the intersection of economic psychology and marketing science.