When flying I'll usually pick up a MD and sometimes even a Flex. I read 'em for months on the can too. Not for training tips and the like but there are some good articles on diet and cardio, university studies, etc.
muscle and fitness is the one i'll pick up in an airport before i fly, otherwise this board is more helpful .. everyone's knowledge and opinion here are non biased for the most part, and a lot of it is based on personal experience