Why do some airplane headphones have 2 Jacks instead of 1 everywhere else?

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Every time I go on a plane it is about a 50/50 chance between headphones with 1 jack or 2.

Why do some have 2 jacks? What is the function of it?

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Anonymous 0 Comments

I totally know exactly what you are talking about but I haven’t seen those jacks in 20 years.
This is still a thing? Where?

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