George, I just had a look at Cameron's shooting script. The directions refer to 'Ruth's suite' and 'Rose and Cal's suite'. Also, in the Southampton scene, Cal (who is described as 'rich beyond meaning') boasts that "I've pulled every string I could to book us on the grandest ship in history, in her most luxurious suites". The implication of that is that Cal has booked BOTH promenade suites, one for Ruth and the other for himself and Rose. Unrealistic, but I guess that's the answer you were looking for.