eli5: Why do most airlines still use 2-pin audio jacks for the in-flight entertainment systems on their planes?

Question

eli5: Why do most airlines still use 2-pin audio jacks for the in-flight entertainment systems on their planes?

In: 600

Answer 1

Two main reasons. Firstly because it discourages the theft of headphones, and secondly because the second jack often carries a noise cancellation signal.