1. One
2. Priority Check-in; Early Boarding
3. No
4. Yes, and No. Well, this is a tough one. NW sent me an invite for status match the past spring. I sent in all the reqired paperwork and they said confirmation would arrive in a couple of weeks. So far, I got nothing in the mail from NW. So I think the answer to the question is: Yes, I tried, unsuccessfully.