Originally Posted by
tossbag
Dude, you're a pretty smart fella, but really?
If you believe Google, the commonly accepted drivers for TCAS were:
1. On September 25th, 1978, a Pacific Southwest Airlines (PSA) flight 182 collided with a Cessna 172 near San Diego Airport. Total fatalities: 144. TCAS development was initiated by the FAA
2. 1986 when an Aeroméxico DC-9 collided with a Piper Archer over Cerritos, California causing 82 fatalities (15 on ground). Soon after, the FAA mandated that airliners in U.S. airspace be equipped with TCAS.