Originally Posted by UnlimitedAkro

FMS navigation is so acurate now, that if you are on an airway and converging with someone on the same airway in opposite directions.... it is directly head on.

We had a C141 one day pass 1000 feet above us about a year ago, and ATC cautioned us he would pass overhead (they arent required to and they dont all the time) and with the angle of the sun we didnt see that guy until it would have been too late. Probably around 800-900 knots closure.