Games on a plane

Been on a long journey recently? Stuck in the snow for hours? What games got you through it? I'm flying to the US on Monday and am already trying to sort out what handhelds to take for the lengthy flight. The DSi is a must for Spirit Tracks alone. I'm also planning on taking the PSP and giving Vagrant Story - will it still match up to those nostalgic memories? - a go. I'll have the iPhone too, which is loaded with games, most barely played. So yes, I should have plenty to catch up on but is there any handheld/mobile game you've played recently that you'd recommend? I could especially do with some recommendations for iPhone games - hey Keef. when you doing another iPhone roundup? Anyway, let me know your handheld recommendations.