Flights are unpleasant enough for me that try to find some mindless entertainment to make the time go faster. I'm too tall to comfortably use a computer in my seat (especially when the ass-hat in front of me inevitably reclines). I don't know when unapplied thinking dropped from my list of entertainment options...

I have a trip coming up next week, seems like it might be a good opportunity to try to do something a bit more useful.

Thanks for your original comment and the sidebar conversation that led me to realize it'd be a Good Thing to get back to it!