What does the tray-based First-Class Mail automation option eliminate when there are 90 or more pieces?

The tray-based First-Class Mail automation option primarily aims to streamline the mailing process by reducing the complexity associated with processing large volumes of mail. When there are 90 or more pieces, this option allows mailers to present their mail in trays rather than in bundles.

Bundled pieces typically require additional steps for processing, such as unbundling and sorting, which can slow down the workflow. By organizing pieces into trays, the need for bundling is eliminated, resulting in a more efficient handling and delivery process. This approach not only saves time but also reduces the likelihood of errors during sorting and distribution, ultimately leading to improved service efficiency.

In contrast, the other aspects, such as extra labeling, manual handling, and flat rates, are not directly impacted by the use of trays for automation in the same way that bundled pieces are.