In the context of Amazon Flex, a program where individuals use their own vehicles to deliver packages, sub same day refers to a specific delivery service offering that prioritizes extremely rapid delivery times. It denotes deliveries that are expected to be completed within a few hours of the order being placed, even faster than standard same-day delivery options. For example, a customer might place an order in the morning and receive it by early afternoon.
This ultra-fast delivery model offers significant advantages. It enhances customer satisfaction by fulfilling immediate needs and impulse purchases. Furthermore, it allows Amazon to compete more effectively in markets where speed is a critical differentiator. The historical context stems from the increasing demand for quicker e-commerce fulfillment, driven by evolving consumer expectations and the rise of instant gratification services.