Airplanes can be particularly dehydrating (think less than 20% humidity) and the long hours sitting in one place can take a toll on your skin. The one skin care product that I cannot travel without is a really high quality (doesn't mean expensive either) essential oil. I dab a few drops on my face and under my eyes before the flight and land without that dry crinkling feeling in my face.
A good essential oil is a powerhouse multi-tasker for traveling and also for everyday use:
Can double as an under eye cream before applying makeup (Let is set first though.)
Plumps up any creases you may have under your eyes at the end of the day (Dab a little on the back of your hand and rub it in, then use the same finger and dab under your eye where you are showing creases. Creases will instantly diminish!)