For U.S. citizens and permanent residents, Hawaii is not considered "out of the country" because it is the 50th state of the United States. Traveling from the mainland U.S. to Hawaii is a domestic flight, similar to flying from New York to Florida. You do not need a passport to enter Hawaii if you are an American citizen; a valid government-issued photo ID (like a REAL ID-compliant driver's license) is sufficient. However, if your flight has a layover in a foreign country (such as Canada or Mexico), you would then need a passport to clear international transit. For international travelers coming from outside the U.S., Hawaii is subject to the same entry requirements as the mainland, meaning a valid passport and potentially a visa or ESTA are required for entry.