1. This is simply show. Political officials write letters all the time (look at the # of Congressmen who write letters demanding that TSA be defunded and then vote for its funding). UA will write back a polite letter and that's the end of it.
2. Neither Guam nor the CNMI have a Congressman
3. So long as UA can sell the seats as is, it's not going to change ths service standard. Even if Congress got into the act, does anybody really think that it's going to enact a law requiring air carriers to serve free sandwiches? How much protein? How many carbs?