How does Amazon Prime ship?

Even an email from amazon stated: "Our Standard Domestic, Two-Day, or One-Day shipping may be delivered by the U.S. Postal Service, UPS, FedEx, or a local carrier in your area. If you select Two-Day or One-Day Shipping, your package may be delivered by UPS, FedEx, OnTrac, or A1 Courier Service."Jan 6, 2010 read more

Shipping Speed Amazon Prime Member Price ; Two-Day Shipping: Free: Same-Day Delivery: Free on qualifying orders in certain cities. Up to $5.99 per item on most other orders. Learn more. 2-Hour Delivery: Free in eligible zip codes through Prime Now: One-Day Shipping: Free on qualifying orders in certain cities. Learn more. read more

Amazon uses multiple carriers to ship products across the U.S. The choice of carrier depends on various factors such as shipping location, destination location, size of package, value of contents in the package, promised delivery time frame, Amazon Prime vs. Free Super Saver shipping etc. A few examples: 1. read more