One correction. The adapter for the Bose QC20 earbuds to use with standard USA aviation female audio jacks is a 3.5 mm female to 6.35 (1/4 inch) male stereo adapter.
Here is one example.
https://www.amazon.com/Homyl-2Pieces...tronics&sr=8-9


I use the Bose QuietComfort® 20 Acoustic Noise Cancelling® earbuds. That, with a 3.5mm to 4.5mm jack adapter works nicely. For me, earbuds are better than a headset because of limited space to hang / store a headset after climbing out. BTW, they are great on long commercial flights to cancel the engine noise and are comfortable to wear. Craig