Originally Posted by
weero
Never had an issue to switch to the FTL card at the gate (3a).
3b will in all regularity be declined unless the earning for the *G carrier was zero.
I think you misunderstood 3b. He didn't mean "retro-claim". You can "check in" again as long as the flight is still open for check-in and change your FF number. But with LH IT, where the miles post will probably be hit and miss.
HTB.