MultiFlyer lets one smartphone control a fleet of drones, which could be used for building inspections, crop surveys or search and rescue missions
Source:
https://www.newscientist.com/article/2255997-a-fleet-of-drones-can-be-controlled-by-one-person-with-a-smartphone/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home