ANC headphones history background sounds with microphones and invert its period using created-in electronics. Then they Enjoy the inverted/reverse sound again into your ears, which cancels out the background noises. if flying nevertheless, i wear the buds deeper in my ear so that it seals in opposition to my earcanal. https://socialislife.com/story3628874/soothing-space-ambient-no-further-a-mystery