Originally Posted by hserus
DO NOT login to the SQ site with your KF number before you checkin online, if you want the miles credited to another program. Even if you specify your miles and more card, it'll somehow credit your miles to your KF card.
This would certainly fit with my one attempt to double-dip (this past January). I waffled about FFPs; had the agent at the SKL change the FFPs (she even showed me her screen, which showed my other FFP had been entered); and then when I checked my KF account in flight, the miles were already sitting there. Sad thing is, I decided not to have her re-print my BP because I saw what appeared on her screen, so now I have no proof. Oh well, at least those miles aren't orphaned.
I'll place this discussion in the FAQ some time over the weekend. I found it very useful. ^