Airline headphones
 

So with the whole situation of Airline headphones using multi-prong jacks, I've seen adapters that allow you to use normal 1-prong headphones in 2 and 3-prong adapters, but I was wondering if you could do it the other way around so I could reuse airline-issued headphones... I have an adapter that appears to convert two-prong to one-prong, but when I looked at it closer it shows in icons that one is for headphones and the other is for mic. Would that work? Also do such things exist for the 3-prong headphones?

Thanks.