I wanted to start this thread based on a past experience. I was flying AA MSP-DFW and was crediting the flight to QF. One of the FAs stopped by and mentioned that they saw that I was a QF FF. As the discussion continued they were rather surprised that a US-based flyer would have a QF account instead of AA (I actually have both, along with JL, CX, BA and AY). In general, I do have FF accounts with all of the US majors, but I also sometimes use accounts of other members of each alliance. I am wondering if others have had a similar experience with airline staff mentioning the choice of program within an alliance and also how many collect in programs in which the airline program does not coincide with the airline one normally flies and is based in a different geographic region than where one does a majority of their flying.