Sony MDR-NC7 Noise-Canceling Headphones for $18.47. Shipping is free on orders over $25. If needed, use this Filler Tool to pad the order for free shipping. Here is a screenshot for your reference. It features reduce unwanted ambient noise by 87.4 percent and includes plug adapter to connect directly to stereo or dual jack of in-flight music services. Most places have this Sony headphones for about $34.