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Door-to-door is a sales technique in which a salesperson walks from the door of one house to the door of another trying to sell a product or service to the general public. A variant of this involves cold calling first, when another sales representative attempts to gain agreement that a salesperson should visit. Door-to-door selling

Cargo airlines (or airfreight carriers, and derivatives of these names) are airlines dedicated to the transport of cargo. Some cargo airlines are divisions or subsidiaries of larger passenger airlines.