Amazon begins three-hour deliveries in ~2K US cities and towns and one-hour deliveries in hundreds of those areas, after 2025 pilots; 90K+ products are eligible (Annie Palmer/CNBC)

Annie Palmer / CNBC: Amazon begins three-hour deliveries in ~2K US cities and towns and one-hour deliveries in hundreds of those areas, after 2025 pilots; 90K+ products are eligible   —  Amazon said Tuesday it's starting one-hour and three-hour deliveries in parts of the U.S., as the company continues to look for ways to satisfy impatient consumers.