I was on the Allure last week and was surprised on how fast debarkation was. I left the ship a 9:20am and was in the airport by 10am. I got a porter to take our luggage to cab, and got another porter at the airport. I wouldn't worry about your departure flight. I wouldn't even think about schlepping my luggage off the ship. Your luggage will be waiting for you in the terminal shortly after 8am.
Our arrival flight was at 11:08 and we were aboard the ship noon. I don't usually fly in on the day of departure, but I had a non-stop flight for a really low fare compared to the day before the cruise. You may need to bring along some oxygen...the ship is breath taking.