The current round of bonuses for purchasing US Airways miles was supposed to run through November 30th only.
Of course I pretty much anticipated that once the bonus ended, there would be another one. Although sometimes it’s a smaller bonus, or targeted only to people that had purchased in the past. But most of the time US Airways does offer some sort of bonus.
This time what they’ve done is extend the November 30-expiring bonus through December 7.
It’s over 1.8 cents a mile to buy miles even with the 100% bonus, my personal approach is that I would certainly buy miles to top off an account or to make an immediate award booking (put a reservation on hold then buy the miles) but I wouldn’t buy miles speculatively just to stock up for future use.
The reason is that I do see risk in hoarding US Airways miles for future use, such as two years down the line. It’s been a few years since they’ve devalued their award chart so there’s risk that the cost of awards could increase. And US Airways is one of the three most likely airlines to shift their program to revenue-based, which presents risk that accumulated miles balances become worth less. (Delta is clearly the leading program for that risk, but both US Airways and/or Alaska could pull the trigger at some point — my guess is what keeps US Airways from doing it is the possibility of a merger with American.)
Still, straight-up buying miles for business class award tickets such as to North Asia (90,000 miles) can make sense at times.