I fly around Alaska for about a week a month, and I've been using Etymotic ER6s and now ER4s for about 4 years now. They're much better at sound isolation than the active headphones, IMHO, but require proper insertion in your ear canals for them to be effective. The sound qualilty is superb, and they're pretty tiny. I see several other manufacturers have come out with comparable 'buds now (Shure, etc) so you might want to read the latest comparative reviews and shop for the best deal.