Whole avocados are a great snack to pack in a bag for the cockpit. Stick with the smaller ones. You only need a plastic knife to cut them in half and a spoon to scoop the meat right out of the shell.

Also, a small jar of NATURAL peanut butter is good (the stuff with no sugar and no oil added). It's so sticky that I'll offer some to an annoying captain just to get him to shut his mouth!

I agree about staying away from the sodas. If you like the bubbly stuff, drink plain seltzer water.