The Control Disease Center (CDC) recommend wearing a influenza mask for anybody that has already a sickness such as the flu or any other precondition. You can read more about the 229e in our Guide.
The coronavirus kind is shutting down the all world with massive quarantine orders for fear to spread further the disease. Over 250,000 people worldwide have been infected already. But to avoid this number that is going to increase exponentially we could all imitate Hong kong and wear face mask for swine flu.
So go Buy your best sleep mask for air travel RIGHT NOW to prevent the 229e from affecting you and/or to prevent-you from infecting other people around you.