An Alphabet Inc. Wing delivery drone flies during a demonstration at Virginia Tech in Blacksburg, Virginia.Photographer: Charles Mostoller/BloombergThe Trump administration proposed a rule to allow more commercial drones to fly beyond an operator’s visual line of sight, a potential boon for companies such as those seeking to deliver packages by unmanned aircraft such as Alphabet Inc.’s Wing unit and Walmart Inc. Transportation Secretary Sean Duffy on Tuesday unveiled the proposal, which would en...