Originally Posted by dkerr
Check out Shure E2c or Etymotic ER-6 noise isolating earphones. Each around $99. They go "inside" your ear canal much like the foam earplugs in the business/first class amenity kits and do a really good job of cutting out aircraft noise.
I suggest skipping the Shure E2 and go straight to the Shure E3 earphones. They are available on the net for US$139 including delivery (don't pay US$179 or more) and worth the extra money. I bought mine for in-ear monitors for stage work, but find them wonderful for airline travel. Much smaller and lighter than NC headphones and far better isolation from external sound sources.