There are a lot of options out there for noise-canceling headphones, but when they drown-out 85% of environmental noise without the radio on, you've found a winner. The Audio-Technica ATH-ANC7 Headphones ($135) offer noise canceling paired with 40mm neodymium drivers for great sound, as well as a detachable cable, carrying case, and airline adapter. Unless, that is, you want to listen to that crying baby three rows up for the entire flight.
Teac of Japan goes high end with their HP-F100 Filltune HiFi Bone Conducting Headphones ($499). These pricey headphones are designed for upper quality sound reproduction and will let you blast Underoath while still being in touch with the world around you — and without killing your ears. Quality features include the ability to have up to .76 watts delivered to each channel, a lightweight design and playback of up to 10 hours on 3 AAA batteries.