Communication of Local Changes to Priority Mail Express Service

Priority Mail Express (PME), formerly Express Mail, was introduced in the 1970s as the U.S. Postal Service’s fastest product, and as the best option for customers to send time-sensitive documents and packages by offering a next-day to two-day service guarantee. Recent transformations to postal operations under the Delivering for America plan are changing the service standards for this premium product. Specifically, in October 2023, the Postal Service deployed a major operational change called Local Transportation Optimization (LTO) that reduced the number of transportation trips to and from select post offices. With LTO, mail collected at optimized post offices remained overnight, delaying its entry into sorting operations. As a result, most optimized post offices can no longer offer PME with a next-day service guarantee. To support this change, on April 1, 2025, the Postal Service revised PME to a one-to-three-day service guarantee.