UPS doubling down on weekend deliveries as e-commerce booms and Amazon looms

United Parcel Service Inc said it aims to more than double weekend deliveries in 2020 as package carriers look for ways to satisfy the always-on demands of e-commerce customers, including rising rival Amazon.com Inc . The world's biggest online retailer pioneered seven-day delivery in 2013, in partnership with the U.S. Postal Service (USPS), and is now spending billions of dollars to speed up its free shipping.