Bought a ticket to Mexico and now you're thinking it's a no go because of the swine flu? You're smart. And you're lucky if you purchased your ticket from US Airways. The airline has issued a travel advisory for Mexico and will issue a credit to ticketholders, allowing them to book another flight to, presumably, a different destination, within seven days of the origination date. The airline is also waiving any change fees. Now, you must be holding airline tickets to Mexico City for travel through April 30. If you bought your tickets through a third-party site like Travelocity or Orbitz, call them to see what the policy is.