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

It is expensive and probably a lot of red tape to update a plane. Smoking hasn’t been allowed on planes for 30 years and yet a lot of them still have ash trays.