Really, THIS my friends is being inventive. @briansolis tweeted this link out from Random Cool Stuff on how to use a barf bag to hold your iphone/ipod. As a fan of MAKE, I LOVE stuff like this. I only included the one image, but you can see more on the website. @AdamSigner brought up a point about it falling if you hit turbulence. Eh.. The iphone is not all that heavy, and if you are really concerned, you can feed the audio line around the tray serving as a fail line like in rock climbing. Else, try to remember to bring some tape. Now, if we can only get remote controls, we have ourselves a gaming console!
BTW, now the many airlines are providing WIFI in flight, you may want to think about VoIP too. http://www.perivision.net/wordpress/?s=voip