On 24 hour flights SYDNEY-VANCOUVER-OTTAWA. Being able to slip out of my shoes while sleeping. Make sure you have thick woolen socks as I find planes do get pretty cold. Maybe its just me. And fluids every two hours. Lots of aloe based moist napkins. I hate it when my snot hardens in my nose. Choosing your seats carefully when booking by getting seat on a row that is empty although this is a bit of a gamble. And my fav although it might cost a few bucks extra is getting emergency exit row seats which gives you some extra leg space.