May want to be careful about using the nutrition label, some sodas are 1.5 servings per can with the serving size of 8 oz (to keep the low or no whatever claims legit, they use smaller servings)

I had a delta agent treat me like a two year old once when I asked for the can, she said, "Well, why don't we just leave this cup with you and if you finish that we can refill it for you later, how's that?"