https://techcrunch.com/2019/04/26/amazon-is-pushing-for-one-day-prime-shipping/

Yesterday Amazon managed to beat out Wall Street’s already optimistic expectations with another record quarterly revenue. In amongst its victory laps, the company announced intentions to shift its free two-day Prime shipping to one-day.

The move has been a holy grail for the company, which has already pushed parcel services and its own fulfillment centers to their seeming limits with the promise of a two-day turn around. While some one-day and even two-day options do exist on certain offerings (and in other locales like France, Germany, Netherlands), an across the board push to one day delivery in the States is a massive undertaking.