Originally Posted by
tracon
I did this a couple years ago.
Bought A-B. Needed to position C-A.
However purchasing C-A-B was cheaper.
Kiosk check in for both itineraries. Credited each PNR to a different FFP.
Told gate agent and f/a I had 2 seats/boarding passes.
No questions asked.
Interesting, so you actually had both BPs scanned upon entering the plane. Assuming adjacent seats, there'd be little reason to look at the tickets and notice the differing itins. But from a security standpoint, this sounds like a pretty nasty loophole, since you could have given that second boarding pass to anybody else at that point.
The security loophole exists regardless of whether you've got two identical itins or not (although if they were truly identical, same name, same FF#, I would hope the system would be designed to question it).