Adapter to Feed Audio from My Device into Bose 3-pin NC Headphones?
 

Has anyone seen an adapter to let me use American Airline's 3-pin Bose headphones to play my own content?

There are some inexpensive adapters to go the other way -- using my own headphones to hear AA's IFE. E.g., discussion and links at https://www.flyertalk.com/forum/amer...eadphones.html

What I'm seeking is the reverse -- I'd like to use the 3-pin Bose noise-cancelling headphones in American Airlines business and first class to listen to the music and videos that I bring aboard in my laptop. And, I'd like the third pin to get power so the noise cancellation works.

Has anyone seen something like that/

If I'm not mistaken one of the 3 prongs is for power - supplied by the plane (whereas a single prong Bose headset you might buy for example has a battery in it). Therefore I 'think' you may not be able to get there from here.

And it looks like that power is 12v, which doesn't appear to be part of the spec of USB type C, but is commonly supported. It's definitely possible, but you'd need to get your own USB C plug with programmable voltage, a voltage regulator to step down from 15 or 20v to 12v, and then a female 2.5mm TS (not barrel) plug, and solder it all together in a way that doesn't look sketchy to foreign airport security. Plus a stereo 3.5mm to 2x 3.5mm mono jack adapter, readily available.

...so....possible ;)