Tinmania t1_j6jg4e9 wrote
Reply to comment by aspheric_cow in eli5: Why do most airlines still use 2-pin audio jacks for the in-flight entertainment systems on their planes? by JJGLC92
The 3.5 mm earphone jack is far older than 1979. It was popularized by transistor radios in the 1950s. But it was mono not stereo. When they designed stereo airplane audio there wasn’t a 3.5 mm stereo standard yet. So they simply used two mono 3.5 mm earphone jacks for stereo headsets. Not much different than what they did with the air driven airplane headsets.
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