> but I think that if in 1900, ... serious dialogues on how to design safe air traffic control systems, you would have been laughed at. In 1900 there were mass

> but I think that if in 1900, ... serious dialogues on how to design safe air traffic control systems, you would have been laughed at. In 1900 there were massive rail stations and harbors. Just say it has to safely receive new train/ship every 10 minutes, and that very well describes the problem. > better directed at making trains or cars safer. In Greece there was train collision recently, somehow passenger and cargo train were on the same track. I doubt any advanced "lessons" were applied compared to 100 years earlier. Most people are ignorant.