I'm on my fifth or sixth pair of Shure Se215's now. Awesome sound, isolation and fit, but eventually the connectivity between the ear buds and the cable will start to fail. (6 months to 1 year). I will probably go for a different brand without detachable cables soon, since my current ear buds are starting to fail again...

For the ultimate silence on airplanes you can put some Bose QuietComforts on top of the Shure buds.