Can you tell us exactly which model headphones you have so we can try to figure out which plug adapter it has. Mine has a mini-RCA single plug and it came with an adaptor to convert to an airline 2-plug adaptor. In that adaptor, one of the plugs is smaller than the other one, but as somebody mentioned above it works with airlines that have a 3 plug slot.

If it's a mini-RCA plug, then you should be good, and we can point you to a mini-RCA to airplane 2-plug adaptor on amazon for less than $10. But I'm confused by your post.

Also which airline are you talking about? Pictures and info might help us to figure out what you need. I'm sure there's an adaptor if we can figure that out.

-David