Great News for UPS, bad news for Amazon:
"The Postal Service change, which went into effect Jan. 1, has resulted in a nearly 10% average rate increase for UPS SurePost deliveries, she said, but it has not increased driving miles thanks to route algorithm adjustments."
https://traffic.americanmilitarynews.com/2025/01/ups-announces-major-cutback-in-amazon-relationship/