eli5: Why do most airlines still use 2-pin audio jacks for the in-flight entertainment systems on their planes?
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Another answer is that airlines will rent you the earphones to use with the two-pin jacks. They make money by NOT letting you use your headphones.
(I don’t see the two-pin jacks much any more — last time I travelled with an entertainment system, there was a traditional 3.5mm jack. )
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