简简单单介绍一下US airways
US Airways offers a compelling mileage program with several advantages, including lower redemption rates for business and first-class tickets, convenient mileage usage across Star Alliance flights, and no expiration on miles if activity occurs every 18 months. However, travelers should be cautious, as once a ticket is booked, changes are not permitted. The current mileage promotion may be worthwhile for those with ample points or specific travel plans.
