Most of us travelling back to US, have flights later in the afternoon. That was no problem for us when Belair had 12 noon check out time but that has gone to 10AM. Late check out can be requested but if your room is scheduled to be occupied that day they will say "no".
Good news is that the airport has become a better place to kill time with the exception of the "downstairs nightmare" also known as B Gates. We enjoy getting a drink, nosh and people watch to pass the time upstairs until close to boarding time.