Are active noise cancelling earphones good for trains and flights? Which ones are best at the best value?
I think you get what you pay for in this department. If you are only flying a couple times a year, they may be hard to justify, but if you use them often, you'll thank yourself and the incremental cost would be well worth it.
Any good in ear ones?
Another vote for QC15s. I travel a lot, particularly long haul flights and the Bose QC15 have more than met my needs over the last few years. Just remember to pack a spare battery!
I just happened to sit next to a fellow QC-15 user on my last long haul from Paris and he had run out and only brought a dead battery with him. I always pack a four-pack of AAAs so I had a spare for him. Very grateful chap. Come prepared.