Originally Posted by
christep
For those of us with long memories, the answer is actually "not any more". 20 or so years ago it was perfectly possible to have, for example, MPO status credit and BA Airmiles mileage credit for the same flight. This changed around 1999 if I recall correctly.
I mentioned at
https://www.flyertalk.com/forum/cath...es-faqs-8.html that it was not that long ago. As of ~10 years ago it was still possible.