As some of you know, I had a couple flights on February 20 and 21 for which I haven't received this bonus yet.
Since others reported receiving the bonus for flights taken weeks later, I decided to e-mail AC and inquire. I just heard back that they are aware of an issue and are working on it.
That's all I know for now. I'll report back with any updates. For now, I thought others in the same boat as me might find this helpful.