Only if you tell us who you are flying with. If you have your reference number you can go to the Airlines website and look up everything failing that ask your travel agent or Cunard....Neil Dow.
I suggest you check your confirmation to see which airline they are using and doublecheck allowances for the airline website. Also, check your cruise information book which should give you details of allowances.
With any scheduled airline the baggage allowance across the Atlantic is 2 pieces per person.Weight of each piece ranges between 23kg and 32kg depending on which airline you are flying with,check with your particular airlin.