Airlines are increasingly embracing mobile devices for in-flight entertainment, and for a good reason -- a tablet is usually much nicer than the cramped, crude seatback systems you normally deal with. Thales thinks the industry can do better, though. It just previewed an in-flight entertainment system, Digital Sky, whose prototype gives each passenger a massive 21.3-inch touchscreen. The portrait orientation leads to some wasted space when you're watching videos, but it can do things that aren't realistic on tinier displays, like serving up the airline's magazine or highlighting things to do at your destination.