Gave this a try last night:
http://www.realflight.com/rf-mobile/index.html
Looking for a little fun on the go? They offer two planes and flying site for free (other planes and site for a small fee.) Not sure it replace the traditional flight sim but it's good fun while goofing off on your phone or tablet.
Greg
I actually like "Absolute RC Plane Sim" by Happy Bytes. I've been using it on my iPhone for a few months now.
I've found it easier than the RealFlight version and is a great way to pass time at the in-laws!
@sihinch I will save you a nice seat by the fire