LAS VEGAS — Walmart has unveiled plans to dive further into the world of artificial intelligence — and drones — to improve its customers’ shopping experiences. In a Tuesday keynote at the CES trade show in Las Vegas, the nation’s largest retailer announced it will be expanding its drone delivery to 1.8 million additional households in the Dallas-Fort Worth metropolitan area later this year. Drones aren’t new to Walmart — which has already completed 20,000 drone deliveries across seven states to date — bu ...