Yapta.com Maybe worth looking at.... Thanks Juli!

Airlines that offer refunds for ANY price drop
Alaska Airlines JetBlue
Airlines that offer refunds for price drops of $75 or more
AirTran Airways Virgin America
Airlines that offer refunds for price drops of $100 or more
Hawaiian Airlines
Airlines that offer refunds for price drops of $150 or more
American Airlines Continental Airlines
Delta Airlines United Airlines
US Airways