It is highly recommended to fill in the American Samoa Health Declaration Form at least 21 days prior to your departure. It does not matter if you're traveling by sea or air. However, due to varying CO Sindications, regulation may vary depending on the nation of origin. It is important to understand that no one will inspect your health while you are onboard, nor can they require you to do so once you land at their port. Hence it is essential for you to declare yourself fit and healthy.