No luck. The drop has to be more than the change fee ($250 Int'l). You'd receive a voucher for future travel for the difference, not a refund.
http://flights.usairways.com/en-US/t...s/default.html
Lower fare guarantee
When a new lower fare becomes available after a ticket has been purchased, customers are entitled to a lower fare guarantee refund within the following guidelines. We will deduct a $150 change fee ($250 for international travel) and apply residual funds in the form of a US voucher. Additional rules and restrictions may apply. Call reservations for a lower fare guarantee.
The lower fare is available for the exact itinerary previously purchased.
No portion of the reservation has been flown.
Lower fare guarantee refunds are not available for online ticket exchanges. Certain promotional fares may be excluded.