4/5 Head-on Collision (Collision Course) (Crash Course) (Sight Unseen)

The probability of colliding in midair is 1 in 100 million!
it happened here!
November 12,1996

A Saudi Arabian Airlines Boeing 747 and a Air Kazakhstan Ilyushin Il-76 collide in mid-air over Charkhi Dadri, Haryanna, India; killing 349 people. Communication problems between the Kazakh jet and ATC, a design flaw in the ATC radar system, and cloudy weather; lead to the deadliest mid-air collision in history

Pilot Error and poor communication(Ilyushin), poor visibility, outdated radar systems and no TCAS on both planes