So, my nephew is in love with Flight Simulator X...or rather, he likes flying around and crashing into stuff. My dad wants to get him something he can fly around in and dick around that's somewhat simple for a 10 year old who doesn't read instruction manuals for anything to play. Any suggestions?

He would prefer something for PC, but the kid has all the modern systems at home so any suggestions would be awesome.

Something arcadey I think would be best. Anything with a free flight mode would be cool.