Fortunately, the planes missed each other by approximately 700 feet. In my opinion, pilots these days fly the auto pilots, and are two dependent on TCAS, and other systems. In this case, maybe they would not have been able to see the other plane, but don't hurt to look out the window either.
Here is the RT story also: https://www.rt.com/news/600887-planes-nearly-crash-us/
Fortunately, the planes missed each other by approximately 700 feet. In my opinion, pilots these days fly the auto pilots, and are two dependent on TCAS, and other systems. In this case, maybe they would not have been able to see the other plane, but don't hurt to look out the window either.