I’ve needed to point out my status with the airline. I actually wouldn’t have thought to do it the first time it happened, except I was asked for payment for my checked bag. The woman checking me then said she saw my status in my reservation. Now I just mention it as I’m checking in, and my luggage is tagged appropriately.
I don’t know with which airline you have status, but with United, I can (but don’t actually do) check a bag that weighs up to 70 lbs. The resort airline check-in has told me that they can’t accept bags over 50 lbs. I didn’t ask them to specify what that meant, so if you are planning to use the benefit of exceeding the customary 50 lbs for checked luggage, I would talk to resort airline check-in ahead of time to make sure they don’t have a different policy.