Be aware that this is a Choice Privileges benefit, so the hotel needs to know you are a Choice Privileges member.
Hey, you though, I am one, I booked a choicehotels.com or 1-800-CHOICE, so obviously they know it, right?
Wrong. If you choose to earn airline rewads (miles or credits) instead of points on a given stay, the annoying reservation system at many Choice hotels overrides the Choice Prilvileges number with the airline FF number. (The stupid system can't hold both at the same time.) In my case, it typically means no newspaper at the door (at those Choice hotels that deliver a newspaper to member's doors). But it would also mean no late checkout privilieges, unless I realized they don't know I was a CP member and I was able to convince them that I am.