Not sure if this should be here or the US forum, but...

I'm going on a trip in March with some friends, and they've already booked their flight on US Airways (PHL-LAS 3/30-4/2). CO and UA say on their websites that tickets can be booked using miles on partner airlines, including US Airways, but when I search the award tools, and when I call the reservation office, they don't have any reward tickets available on any US flights for my dates. My questions are two-fold:
1. How long before the flight does US make its award seats available on other *Alliance partners, specifically CO/UA?
2. Are these seats typically available for 25k RT(saverpass), 50k RT(Easypass) or 60k RT(what US is charging)?


Thanks!