D to A; have you spent your 3,000 hours next to a window always on the lookout for traffic? If so, you would have seen a lot of "close calls" ie aircraft that look a lot closer than they are.
If it was TCAS mandatory airspace, I can assure you that you'd have felt some sort of deviation as the pilots got out of each others way. I had that experience as a passenger a few years ago over Turkey. I'd just finished my lunch and felt a sudden bit of negative G as the nose went forward. I talked briefly with my wife, pondering if it was a TCAS event and then opened my window screen. As luck would have it, a B737 went sliding by (maybe less than a half mile, but what do I know) and he was on his way up but it was easy to see that the two aircraft had previously been on a "less-than-separated" track.
Therefore, in answer to your question, I can reassure you that separation was maintained and everybody got home safely. QED and end of thread taking up bandwidth
