I cannot find anything in USA 3000's Contract of Carriage with repect to ticket validity. It is entirely possible that December 15th is the latest they will book you for. Perhaps this is because of the holiday travel period? Anyway, when booking with "discount" carriers it is always wise to know what you are getting into once you purchase your ticket. USA 3000 seems to be one of the worst when it comes to flexibility on policy.
On the other side of the equation, there is the fact that this whole Swine Flu thing has been blown way out of proportion by the press. Cancun was an area not affected. You probably could have traveled without any exposure.
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