As TECH CRUNCH describes, Amazon and USPS have partnered for Sunday deliveries in New York and Los Angeles. To qualify Amazon customers must purchase the $79 annual Prime Membership. That guarantees two-day delivery. Here is the article from TECH CRUNCH.
That two-day turnaround was a client-saver for my business. To put together a proposal pronto I had to read a book by a sports figure. Most brick and mortar bookstores do not stock non-best sellers and oldies but goodies. Prime Membership was what it took. A nice perk was that the delivery was made early in the day. That gave me more time.
The pilot program will be closely watched by security analysts and "This Town" folks.