Originally Posted by
CloudCoder
It counts as one stay.
There are various rigorous definitions but, in plain talk, if you spent "last night" in the same location, it's the same stay.
The above is accurate AFAIK.
It doesn't matter if you physically checked out, went to the airport, cancelled flight made you book another reservation and you checked back in at the same property. Still considered one stay.
However, make sure you get the amenity this time if you got the bonus points the first time around. Even if FD asks points/amenity and you choose points, you'll still only get 1000 added at the end.