Which delivery method is not typically associated with USPS carriers?

The delivery method that is not typically associated with USPS carriers is the use of planes. While USPS utilizes planes for transporting mail over long distances, especially between major processing centers and regional hubs, individual carriers do not deliver mail directly using planes. Instead, they usually work with the mail that has been transported to local post offices by air or ground means.

In daily operations, USPS carriers primarily rely on various ground transportation methods such as postal delivery vehicles, bicycles, and sometimes walking routes to deliver mail directly to recipients in their designated areas. Ground-based delivery methods align more closely with the day-to-day tasks of postal carriers, who focus on delivering to individual addresses within their service routes.

Thus, the use of planes is a logistical component of the USPS process, but not a delivery method that carriers themselves employ in the field.