BIS Only
Here's the information US provided in response to my "lifetime" miles inquiry:
US Airways lifetime flight miles are accumulated from the start date of your Dividend Miles account as long as your account remains active. Only credited flight miles on US Airways owned and operated flights (this includes previous flight miles on PSA, Piedmont, and America West) count toward Million Miler status. Bonus miles, preferred mileage bonus, class of service bonus miles and flights on partner airlines do not count.