Investigations of two midair collisions about six weeks apart in 2015 led the NTSB to conclude air traffic controllers erred in both cases. While the safety agency urged the FAA and contract tower operators to use the deadly crashes as object lessons with which to train controllers, the NTSB did not specifically ask the FAA (or others) to address availability or affordability of cockpit traffic awareness technology that, according to both investigations, might have helped pilots prevent each tragedy. The safety recommendations and findings released Nov. 15 include advice for pilots.
Source: aopaNTSB calls for training after midairs