Unless you're shelling out big bucks for business or first-class tickets, your in-flight entertainment system probably looks like something from the last decade. The monitors airlines put in the back of headrests are typically cheap, low-resolution, and have a pretty pathetic selection of content. That means you're usually better off pulling out your phone or tablet, and if the aeroplane's on-board Wi-Fi sucks too (which it probably does), you'll be limited to whatever you managed to download before you sat down.