It's always nerve-wracking when the person beside you on a plane is coughing, but I'd imagine that them wearing this mask would only heighten the effect.
By Icelandic designer Sruli Recht, Masked in Flight is a collection of updated surgical masks with the modern, swine-flu-conscious traveler in mind. Integrating features like replaceable N95 particle filters for safe breathing and light shields for easy resting, I can't argue with the practicality. But I'd guess that, if Recht's masks do keep you healthy, it's because they virtually guarantee* a perpetual, 50-foot personal quarantine. [Sruli Recht via designboom]
*That is, unless you're wearing the optional boob wrap.