Lenovo 27" Horizon - perfect for your meal tray in coach.
Or the Sony Vaio Tap 20" if you want something a bit more compact.
This is a parody, right? Your 20" thread (which you bumped) pointed out that that one is going to be too wide for many coach seats. The 27" one won't be usable in landscape in most domestic US first seats. In portrait, either one will be so tall that if the seat in front reclines at all, it will be tilted forward towards you unless the base is in your lap.
Add in the disappointing resolution on the tap, and a battery life that will barely make it from NYC to Chicago...