In my experience, that should be good enough.
Don't worry about it.
The tones are designed to cancel out the incoming sounds. As a result, the user doesn't hear any tones. Bose noise cancelling headphones (and probably most other active noise cancelling headphones) are tailor-made to cancel out the hum of the airplane (and a car on a highway). I recommend active noise cancelling (worn over earplugs), because they work so well for aircraft noise. I am also concerned about those headphones doing damage, but I figure that one ought to be safe if one wears them over earplugs.
I would bring that, in case the noise cancelling headphones stop working. It would not be easy (although not impossible) to wear Peltor muffs for 15 hours straight. They are not nearly as comfortable as the noise cancelling headphones.
This is indeed how it works. The point is that the new wave on the right (the viewer's right) of the image is a straight/flat line. In other words, right now what you see on the right of the image are two waves. When they add up, the high of the green wave cancels out the low of the yellow wave. A flat wave, ought to be equivalent to the absence of a wave.
Those are X4A, and in my experience they are less comfortable than X5A (that I was talking about). Basically, they are fine/comfy for the first hour or two. I wore them for longer than two hours, on multiple occasions. Eventually you begin feeling like your head is in a vice. Of course, I would prefer spending 10 hours feeling like my head is in a vice to a T spike lasting months, so I am not complaining.
It sounds like you haven't seen X5A. I have both - X5A are literally Twice as wide as X4A. X4A are great when you have to be out in public. I have worn X5A in public, with no problems, but it certainly doesn't feel good. I remember wearing them as I was exiting a supermarket (I didn't want to be near the place where people return their metal carts without protection - it gets noisy there) on Halloween last year. A small child became wide-eyed and couldn't stop looking at me (and my X5A). It was hilarious how she was not interested in all of the people around us who had been wearing silly Halloween costumes.
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