I tried to search for this answer but it's a difficult one to search. I have both the annual 1-4 cat free night and the 2 free nights from signing up for the credit card (I had an old card for more than 24 months, canceled it, got a new one and got 2 more nights).

When booking online I don't see any indication of what certificate is being used. I want to use my 1-4 cat free night on a 1 night weekend stay at an airport hotel and save the others for nice hotels. Do I need to call to book these or am I missing something that indicates which award is being used?