With a callsign like "Flybywire" I would have thought that you knew all about this subject.
However, it was not ME that said that MP3 players caused difficulties with airline nav and control systems. It was others - if you looked at what I had to say I was questioning that MP3 players were an issue - laptops - mobile phones - pacemakers as well. I was saying that lawyers were the problem.
I love skippers BTW - they are captains that are actually older than me.
And also BTW - in the 1980s and 1990s we had many devices which generated RF - not MP3 players I agree - many other devices which emitted lots of RF - including vibrators.