To never miss out on free breakfast
"If you know you're not going to be able to attend whatever complimentary meal they're offering because you're leaving before it starts or you know you're not going to be up until after it's over, check with the hotel to see if there's some kind of snack or 'sack lunch' they can provide before or ahead of time. Usually it's just a piece of fruit, a bottle of water, and a thing of string cheese, but that's saved my growling stomach on several occasions."
—A flight attendant with one year's experience