The NTSB this week completed its investigation of two fatal mid-air crashes that occurred in 2015, and on Wednesday they issued a Safety Alert urging pilots to make use of cockpit technologies that can help them to see and avoid other aircraft. The alert reviews the two recent crashes as well as two earlier ones, and notes that in each case, the pilot had access to technology in the cockpit that may have helped avert the crash if it had been utilized.
Source: avwebNTSB Issues Safety Alert On Midairs