Once they receive it, it usually takes at least a couple of weeks to hear anything back.

As far as your second question, only the folks in crew recruiting would know, and they don't tell you until they get you in the conference room with all the other candidates on interview day. Even then, it can change between interview day and when they offer you a job. None of the three plane/base combinations I was offered to choose from were on the board on interview day.

-NTFB