I have a Cat 1-5 Rewards Certificate expiring 2/20 and was expecting to just lose it as it is hard to find Cat 5 or less in Europe. But, I'm now looking at going to Rome that week and there is a Cat 5 near the airport. I really don't want to stay there, but I figure it might be worth spending a night there free just to keep from losing the certificate.
So, my question is would I need to use it on arrival on 2/19? Or, is the expiration date just for booking and I could book it for 2/22 and spend the night there before departing on the 23rd (which I think would make a little more sense)?