Originally Posted by
DrRodneyMcKay
You cannot "double dip" - I tried, and was informed that I'd have to pick one program for my points to go into. I picked Hilton since those, unlike Delta, expire (also I'm rolling in Delta points).
You can have accounts with multiple airline/hotel programs (I've got them with AS, DL, AA, and will set up one for UA soon), but you can only register a credit card with one program at a time.