Another air add-on commission opportunity bites the dust. Following similar moves by Carnival Cruise Lines and Royal Caribbean International, Norwegian Cruise Line and NCL America will no longer pay commission on the air portion of cruise bookings. The new policy goes into effect for all new bookings made after November 30, 2007. The line said "this change will enable us to continue to offer a competitive air/sea program and to maintain a cost structure in line with our major competitors." Some other lines, including MSC Cruises, continue to pay air add-on commission; MSC's is 10 percent. (SY)