On the website if you join as a "Registered Customer" it says you can get 5% off your flight. They then have a FAQ section on Registered Customer v. KrisFlyer, but I didn't find it too helpful. My question is, can I only be one? I don't have a KrisFlyer account/number yet. So if I sign up as a Registered Customer to get the discount for my flight, does this mean I can't then sign up for KrisFlyer? Do I need to pick one or the other? I see if you have KrisFlyer account you can't sign up to be a Registered Customer, but what about the other way around?