Thank you very much for the quick replies. I forgot to mention that I am *Gold as well (United 1K), although my guest would not be flying at all that day. I'll give it a try, but certainly not a tragedy if I can't bring her in.

Also, am I correct that a J fare on LX is the lowest business fare and considered to be beneath a Z fare? I am used to having it the other way around on UA/CO.