Originally Posted by
garykung
The only way to stop automatic crediting is not to provide an account number.
However - it also means you won't get any benefits out from your account in most instances.
Once the number is provided, it is automatic unless the number has been removed.
I have at least always had lounge access, even after asking the checkin staff to remove my number. Sometimes I already had the lounge invite, other times, I just went to the lounge and showed them my silver card. Both no problem. Not sure about other things, such as getting priority for Ops Upgrades.