Just a little update on these FFT number changing at the gate.

It did not work for me. I made the booking and checked-in using my A3 *G status and asked the agent at the gate to change it to SQ. Which she did and said it was all good.

But the miles still got credited to my A3 account. No harm done but that's still 6000+ miles in the "wrong" account

For info, it was a ZRH-SIN flight on SQ.