I was recently sent a sample of Arm & Hammer Simply Saline Nasal Releif Spray, which can be used before, during, and after a flight to clear the nasal passages and deliver much needed moisture. This non-addictive formula comes in a travel-size and can be used alone or with a cold or allergy medicine.
It does take some getting used to, to spray saline into your nose (I sneezed the first few times I did). However, it does add moisture and help soothe dry, irritated nasal passages.
Simply Saline can be found at a variety of stores, including Target, Walgreens, CVS, Walmart, Home Depot, Ace, Lowe's, and many grocery stores.