An article from the Washington Post outlines that D-NAS works by having drone users input their drone's flight radius as well as the intended flight time. The system will then take this data and send it to air traffic control at nearby airports to help the airports keep track of how many drones are in the area and whether or not they pose a threat to aircraft. Another added benefit that the article points out is that D-NAS allows drone users and air traffic control to view a map that points out exactly where drones are flying in real time. In addition to real-time monitoring drones, D-NAS will also store that drone's location to track the patterns of drone flights around specific airports. The article mentions one particular air traffic safety manager that said he would be able to analyze the data so that he could see the most popular locations for flying drones and use that as a basis for where to post caution signs.
While the article mentions that there have been, "764 drone sightings near airplanes in 2015", it does not expand on this and leaves me wondering just how big of a problem these drones are for planes anyway. First, how frequent do incidents involving drones and planes occur? Second, how serious of a problem could it be if a drone and a plane were to collide? A different article from the Washington Post notes that there were 25 truly serious incidents where a drone and a plane came within only a few seconds or feet of colliding, and that there were about 176 total incidents from June 2015 to November 2015. As to the severity of a drone-plane collision, many aviation safety experts have stated that if a drone were to be sucked into a jet engine or even collides with a plane's propeller then the damage could be catastrophic. I think one major aspect that has been largely overlooked is that drones in general are mostly unregulated. While there are some restricted drone flying areas, they can be very difficult to enforce. By tracking a drone's location, D-NAS allows air traffic control the ability to better monitor their restricted areas.
Source #1 https://www.washingtonpost.com/news/innovations/wp/2016/03/29/how-airports-and-the-drone-industry-are-teaming-up-to-protect-planes/
Source #2 https://www.washingtonpost.com/world/national-security/near-collisions-between-drones-airliners-surge-new-faa-reports-show/2014/11/26/9a8c1716-758c-11e4-bd1b-03009bd3e984_story.html