Unfortunately, I have to amend.

Whereas originally this TA said ticket would be plated on AA, she now states it will be plated by carrier w/ first international segment-- so QR in my case. She seems to get quick and authoritative answers from QR help desk on each and every question, but, I know some folks will be skittish about bing ticketed by QR-- event though a re-issue can obviously "fix that problem" after travel commences, etc.