The answer is: yes. Always wear sunscreen while flying. A recent article in Condé Nast Traveler warns us it is in fact possible to get a sunburn in the air, whether or not you have a window seat.
"A recent study in JAMA Dermatology found just one hour at 30,000 feet could expose pilots to the same amount of UV radiation as a 20-minute tanning bed session would."
So, what can you do the next time you travel? Pack sunscreen in your carry on, apply before and during your flight and pull the shade down when the sun is beating on your window.
Safe travels folks!