Hi,
The SIn KIX GUM with ana has biz to KIx then it has the all y class to GUm except that the flight is operated by a subsidiary of ANA (think its air japan from memory) and the forward seats are old biz type seats. Star Gold gets you one of these seats but meals are same as Y. In fact its a cold snack of seaweed rice rolls and western sandwiches plus kit Kat and drinks.
Flight is pleasant though and so is Guam and the Chamorro people..
cheers