Buddy Pass Listing Problem

Hi everybody,Maybe this has already been discussed somewhere, but I searched around the forum and couldn't find an answer to my question.My wife and I are trying to fly from Miami to London at the end of March. We hoped to use a buddy pass through a family friend who is an ex-employee but still has benefits.She was able to get us on a different international flight last June without any difficulties, and that was great. Now, she says that it seems she is unable to add our names into the system, and unable to get us on for a standby fare on this flight to London at the end of March.Does anybody know why she might be unable to get us on to that flight, or what we could do to solve the problem?A couple of notes that might be relevant:1) I may be using the term 'buddy pass' incorrectly here; it's whichever pass an ex-employee can use to get a discounted standby fare for a non-family member. I know different passes have different names, so maybe I'm using the wrong term.2) Our family friend was actually an employee of Northwest, not Delta, but since they've merged she has been able to use buddy passes on Delta flights.I hope all of that is clear, please let me know if anything is confusing. I'd really appreciate any kind of feedback you guys can offer on this issue.Thanks in advance!