US Airways Dividend Miles members can book a flight online at usairways.com and earn a one-time bonus of 1,500 miles. The airline is offering the bonus for a limited time to highlight the launch of its updated Web site, which has a new look and additional features. Visitors to the site will now have more ways to find low fares and the ability to manage all of their flights in one place. To earn the bonus, register for the promotion at http://www.insideflyer.com/link/?2119 before making reservations and book a flight online by March 31 for travel through July 31, 2010. Flight segments must be operated by US Airways or US Airways Express to qualify.