The worst place to be during an epidemic or a pandemic is in an airplace or sitting in a terminal. A lot of the workers fly while still sick (up to 50% do this). You're in a confined space breathing recirculating air. You're sitting uncomfortably close to others, even forced to touch their airms next to you.

It's common sense to be wary.

Be smart, especially if you're pregnant, for pregnant moms have to watch flying anyway for various health reasons, and we know that some influenza manifests far WORSE in pregnant women.

Be prudent. Must you fly now?
[link to www.ncbi.nlm.nih.gov]
Professional aircrews' attitudes toward infectious diseases and aviation medical issues
"Aircrews often flew while ill (or with ill crewmembers); 52% flew until fever reached 38 degrees C (100.4 degrees F) and an additional 37% flew up to 38.89 degrees C (102 degrees F). Rate of annual influenza vaccination was quite low for all groups, but especially so for airline crews (21-27%), even given potential occupational exposure risk. Crews also had strongly differing perceptions of employer views on self-grounding, depending upon employment setting."