Don't know what your angle is, I really don't care. But I will say that I have been in military aviation for 18 years, had my fill of visual IFF both air and ground. I have been through many safety schools that used civil aircraft accidents for the training. After all that, I can honestly say the only civil jet I can identify without a reference is the 747. Could be I am a slow learner but I believe it is because I could care less.
I couldn't tell you the difference between a 73 and a 75 especially by the sound. I think you are barking up the wrong tree with this crazy theory.
I couldn't tell you the difference between a 73 and a 75 especially by the sound. I think you are barking up the wrong tree with this crazy theory.