I did not make myself clear, sorry. I am interested in historical patterns of emptiness, not current seats available. If we can see that flights from X to B at 9 am are 100% full and same X to B at 2 am only 65% full, data from the past year, we can learn something about probability of an empty or two seats. Sure, I'd prefer Business or Premium Elite, or Tiger Woods' private plane but i don't see that in my, humble, future.