Why Two Headphone Jacks On Most Airlines ?

I know each one carries a mono signal. But I still don’t know the reason why this started in the first place. Years ago the airlines pumped music through air tubes to each seat. How did this evolve into the two plug system. Some airline now have adapted to the more standard single jack.

airline jack

It would be great if someone could give us a few more answers. Please feel free to comment. Thanks.

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