Seems to me you'd need a simple mixer...
Simple mixer
or do it redneck style and if you use muff type things (which I imagine you would in a small noisy plane) cut a hole and dangle the ear buds thru
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“IN MY EXPERIENCE, SUSAN, WITHIN THEIR HEADS TOO MANY HUMANS SPEND A LOT OF TIME IN THE MIDDLE OF WARS THAT HAPPENED CENTURIES AGO.”
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