Southwest Airlines has added OS X as a supported platform for their popular Ding! software that notifies customers of special airfare deals. Prior to the recent update, the software was only available on Windows. OS X version 10.3.9 or higher is required to use the software. Link From the site: "Beginning March 20, 2006, Mac users can download DING! and start receiving Southwest Airlines hottest deals delivered directly to your desktop! Plus, if you download and install DING! for Windows or Mac between March 20 and April 3, 2006 and keep it on your desktop for 30 days, well deposit two Rapid Rewards credits into your account!"