1. Noise cancellation headphones - I use Bose QC15, which are good,but you still hear high frequencies (voices)
2. Filters for your screen, so the person next to you doesn't see anything.

N.B. 1st class isn't really better, but often even more crowded on some routes

1. Active noise cancellation headphones, which contain a microphone and chip that listens to the noises around you and acoustically cancels it out. I use Bose QC15, which are good,but you still hear high frequencies (voices)
2. Privacy Filters for your screen, which block angled light making the screen appear black to anyone looking at it from an angle other than straight on, so the person next to you doesn't see anything.

N.B. 1st class isn't really better, but often even more crowded on some routes