Here is my reply regarding e-rewards posting date from US AIRWAYS:

Thank you for contacting US Airways.

There was a technical problem with activity posting dates for e-Rewards.
But, as long as your e-Rewards activity was on or before November 14,
2011, it has counted as a hit in the Grand Slam promotion.

We're sorry about any confusion.

So my e-rewards post counted as a hit, even though it posted after 11/14/2011.

So I ended up getting to my goal of 24! and 60,000+ points!