These Sony NC20 noise cancelling phones feature an active 10db noise cancellation circuit, and sound similar to many of the decent Sony high end phones, like the MDR-7506. (Well, it's arguable.)
These are in excellent condition. I've used them on 3 flights, and am upgrading to Etys, so my loss is your gain. Good street prices range from $99-139. I'm asking for best offer in the neighborhood of $70. Paypal preferred, US only please. I've got the original packaging as well.