Originally Posted by Eastbay1K

A TA can easily add multiple FFNs to a PNR. (Apollo example from the help screen - >MP*UA1234567*DL12345)

I'd suggest that the OP's travel department contact the AA sales rep to send out a training memo. The only likely thing that would happen by plating on the wrong carrier (and the system wouldn't automatically do that,and I don't remember the last decade that I actually saw a physical plate-issued ticket) is a debit memo back to the issuing agency.