Two styles of headphone adapters
 

Has anyone noticed that there are two distinct styles of dual-plug headphone jacks used on airplanes? I have a Bose-supplied adapter; both pins are of equal length and width.

I tried to use this adapter in First Class on a reconfigured United 767-300 and found that it didn't work! Each of the two pins needed for this jack have unique length and width. Fabulous. Sadly the drinks weren't served in ruby slippers, and the reading lights didn't strobe; some things were actually standardized. Are there single adapters (mentioned in the other thread?) that work for both plug styles?

You don't really need an adapter for the UA audio system. Just plug your Bose headphone into the 3.5 mm jack and it will work.

I am not completely positive about the new configurations though in the old there were two jacks as well. Unlike some of the other airlines where one jacks is left and the other is right for stereo audio, on UA one was a normal 3.5 jack and the other was a special power jack for their proprietary NC headphones in F/C on int'l routes. If you had your own NC they would work fine with just plugging into the standard jack.

be carefull....some of those plugs are actually 2 mono channels...you can tell by looking at how many bands are on each pin on the airline headsets....

Never thought of that, I'll give it a try. Thanks!

I think that some aircraft have two jacks for separate left and right, others have two jacks for stereo audio and noise-canceling signal.