https://www.cnbc.com/2019/04/26/amazon-expands-one-day-shipping-four-experts-weigh-in.html

Amazon's core two-day shipping offering has been cut in half.

The e-commerce giant announced Thursday that it planned to offer free one-day shipping to all Prime members, bookmarking $800 million in upgrades to its warehouses and delivery services during the second quarter. Amazon also beat first-quarter earnings estimates by a wide margin.