Very limited options at the airport location. Only specifically listed GF item was a grilled bourbon chicken. Seems you’d be able to do steamed veggies and steamed rice as well but not specifically listed. If you tolerate soy sauce (still seems debatable if gluten remains after the fermentation) then menu opens up a bit so long as you avoid fried items.
— Gluten-free items are marked on the main menu
— Not Much