BREAKING: Futures Edge Higher As Boeing, Nvidia Lead Dow Amazon (AMZN) will test an "ultra-fast" delivery service in Seattle and Philadelphia that promises to bring household essentials to customer doorsteps in about 30 minutes or less. Amazon stock gained early Tuesday, while shares of Instacart parent Maplebear (CART) fell and DoorDash (DASH) stock edged lower. Amazon said in a blog post late Monday that it will offer "thousands of everyday household essentials and fresh grocery items" through the service ...