Yes, you are welcome to bring your own food on Hawaiian Airlines, but you must navigate strict USDA agricultural regulations. If you are flying to Hawaii, you can bring almost any prepared food (sandwiches, chips, etc.), but fresh fruits and vegetables are prohibited to prevent the spread of invasive species. If you are flying from Hawaii to the U.S. Mainland, the rules are even stricter: all your bags must pass through a USDA agricultural inspection before you reach the gate. Most fresh produce (including pineapple unless specially pre-certified) and certain flowers are banned. Commercially packaged "souvenir" foods like Macadamia nuts or Kona coffee are perfectly fine. Because Hawaiian is one of the few airlines that still provides complimentary meals in Economy, most people bring only snacks, but having your own meal is a great "backup" for pickier eaters.