Is the traditional air transport a customer payment release document?

Traditional air transportation is not that customers pay and then release. According to relevant public information, traditional air transportation usually refers to the mode of "cash on delivery", that is, customers pay after receiving the goods. In traditional air transportation, customers need to sign a contract with the freight forwarder first, and then the freight forwarder arranges flights, customs declaration, stowage and other work, and informs the customer to pick up the goods and pay after the goods arrive at the destination. The advantage of this model is that customers don't need to pay for the goods before delivery, but the disadvantage is that they can't completely guarantee the time and safety of the goods arriving at the destination.