Originally Posted by pinniped

Watch out for N as well: long ago, this was either an award or an upgrade bucket...I forget which. Now it's a regular revenue seat...I recently bought one that is in the same range as what I would have paid for a G or T. After a series of emails with United, I was able to confirm that they did indeed repurpose the fare bucket a year or two ago. Thankfully, they gave me a retrocredit of United MP miles, but alas, no A3 miles.

United also has an annoying habit of showing you a wide variety of Q, M, H, etc. "-UP" fares when you query on A. I'm never sure how these will post to the rest of the alliance so I'm hesitant to buy them. It's a fare that seats you in the F cabin but (I'm guessing) posts to the outside world as a coach fare. Maybe someone here has experience with these?