Moisturize: Airplane air is arid air, but one easy way to lock in moisture is to use a thick cream or oil on your face throughout the flight. If you are going to use a facial mist, make sure you spritz before adding lotion to make it all the more effective.
Stay solid: If you want to avoid getting your favorite beauty buys thrown in the bin at security, opt for solid formulas when possible. Choosing a lipstick or balm over gloss will win you points with TSA. Also, try choosing powder over cream for foundation and blush.
Cabin care: Hair can get unruly with those awkward headrests in the way. Try tying strands in a scarf to preserve your style. You can even apply a leave-in conditioner before you take off to get an in-flight hair treatment. Carry on a dry shampoo and brush to revive your coif post-plane.