This is a Promotion Code. You have to know the ship and sail date that has that promotion. It's not an automatic 'take $600 off my cruise' type coupon. And that may or may not be the best promotion going. For example, you may select a sailing that has a senior, military, resident, or past guest promotion. You may qualify for any or none of these. There may also be a special limited promotion going on that may or may not be better than these promotions.
I'll give you an example; let's say the promotion code was RESFLA. That means there is a promotion available for Florida Residents only. The promotion code of PFDA is for Police & Fire Departments only.
But those promotions are not available for every ship and every sailing.
Best advice is talk to your Cruise Specialist and let them know what you'd like to do and let them do the research to find you the best promotions.
__________________ Travel Agent/Cruise Specialist w/13 yrs exp and 48 Cruises on 11 cruise lines! Favorites: Paul Gauguin - Tahiti: Uniworld River Cruises - Europe; Celebrity Solstice-class ships; Holland America - 12-nights Baltics & Russia; RCCL - 14-nights Greek Isles, Turkey, & Croatia; Holland America - 14-day Alaskan cruisetour; 10-night Canada/New England cruise; 21 days Hawaii w/7-night NCL cruise; Oceania - 25 days in Asia; more than 3 months touring Europe by train. And many all-inclusive resorts!