Here's a question - if I am a QF FF but buy a ticket through Qantas and use my FF number from another program (such as LATAM), would QF know/care that I was crediting the flight to another?
Here's an answer
In this scenario, QF is acting as the sales agent, and in that sense only care about their revenue. Because the FF# is different, loyalty isn't involved and so they wouldn't be tracking it in terms of John Smith QFF# is the same John Smith with, say, an AA# (could be two totally different people)
The only instance I have seen of an airline seeming to take note and tracking is SQ who somehow (I still don't quite know how!) associated a long dormant and never used SQ# on a booking where I was crediting SQ flights to UA(both numbers showed on the BP) Now this makes sense in respect of SQ's PPS program keeping track of J and F spend as separate to KrisFlyer, but I never gave them that SQ# just the UA#. Must have been some pretty good data matching going on there which was quite impressive in its own way.
With that example in mind, it's possible I guess QF could do similar, and just not make it obvious.. but you know what? I doubt it very much.
Clearly the technology exists on some platforms to manage this sort of thing though.
It may also be a case of laws being different and restricting what can and can not be matched and tracked (I have an idea someone like tripping_the_rift may have more understanding of these issues).
I mean if you suddenly got an email from QF saying "Hey we notice you're crediting to AA now what's with that?" it probably wouldn't go down too well... even if it was phrased more of a "here's a bonus if you credit back to QFF" or something.
It does raise some interesting issues.
Now of course, it's one thing if one tickets or flies QF sectors and they could match and see that one was crediting to another program, but as JohnK noted they would have no way of knowing, except from responses to those Surveys they send out every so often, if someone flew on Star, Skyteam or even LCC's like Scoot, AirAsia, Ryanair etc... and almost certainly not VA.
In my view given QF's historic practice of seemingly doing nothing to acknowledge a big drop in travel or spend (eg: a P1 like TonyHancock going from thousands of SC's a year to 0) they either don't bother to keep this metric(which I find hard to believe) or simply don't view it as important to chase back (unlike some other programs where I've changed spend or travel and had inducements to come back when it's been noticed by the system).
my 2 cents.