They built a nice travel-friendly place inside Logan Airport in the United Terminal. I frequented it back in the days when business travel was a thing.
and one at the end of terminal B around gate 9 or so. But, if you just want fried clams, go to Kelly's right around gate 15. Kelly's is Kelly's Roast Beef, but they are known for their clams. They are opposite the Potbelly and Wolfgang Puck place near the TSA that serves the first set of American gates. My regular route when I'd visit my Dad.