on our first trip to the usa soon and was hoping someone might be able to answer a question re hand luggage. We have a case that measures 18x12x8 not including the wheels, ie the actual case part. Britannia says that you can have hand luggage of 18x12x9 so ours seems to be within the limit. What I'd like to know is does the max size include the wheels part which would add approx 1.5 inch on the length size making it 19.5 (ie too big). Apologies if this seems like a dumb question but we're not sure and thought we ask here before having to phone Britannia.