Valuables 

Always, always, ALWAYS pack your most valuable items in your carry-on.  If you pack it in your check on luggage there’s a chance it will get lost.

Change of Clothes

It’s a good idea to pack an extra outfit, just in case your luggage gets lost.

Lip Balm

Being on a plane is brutal on my lips.  I have to have lip balm on hand at all times.

Entertainment

I’d like to say I could sit and relax for a few hours but I can’t.  I need to be doing something productive.  I love bringing a great book or my laptop or ipad on flights so I can keep busy.

Cozy Jacket/Blanket

Aside from being dry planes are also cold.  I shiver quite easily so I always bring something with me to keep me warm.