Originally Posted by
TGarza
I am not aware of any US state that allows an 18 year old traveling alone to consume alcohol in the airport.
Many states at 18 consider the person an adult.
True, but in the US (as an example) drinking age is 21 (assuming rules being followed). Maybe it's because they're entering into a contract so 18 (as an adult)? Regardless, there would be some reason why they chose that age as the minimum to sign up.