I suspect this would be covered by trip interruption and trip cancellation insurance which comes free if you made the purchase with a Citi Aadvantage Platinum MasterCard (up to $1500).
http://www.citibank.com/us/cards/car...t-svbenits.jsp
Trip Cancellation/ Trip Interruption:
In the event you are prevented from taking or continuing a trip you billed to your Citi® Platinum Select® / AAdvantage® World MasterCard® account, you are eligible to receive up to $1,500 in Trip Cancellation/Trip Interruption coverage.