Amazon is rolling out "ultra-fast" deliveries to get packages to consumers in 30 minutes or less in dozens of cities across the U.S., the company announced Tuesday, marking its most aggressive push yet into quick commerce. The company started piloting the service, called Amazon Now , in a handful of American cities in December. It's also launched deliveries in 15 minutes or less in parts of Brazil, Mexico, India and the United Arab Emirates. Amazon said in a blog post that it's expanding the