moisturiser
Kangaroodance
save yourself heaps of money and do your skin a favour. Use aqueous cream. Buy at any pharmacy. It's cheap as chips and the basis for all the fancy creams you can buy around the world. Recommended to me by a dermatologist when my skin went crazy after using brand name items.
Also, very important that you drink litres of water when flying. Force yourself. Every time a crew member offers you a glass of water, take it. Remember to return the favour, and when you have a drink offer one to everyone else in the galley. At the very minimum, drink a litre every 6 hours. Also important to drink before and after a flight.
Good luck. Stay hydrated.