Efrem's correct - they've moved the shuttles around so many times I have to remind myself evrytime I fly out of Logan (I still look for the Trump Shuttle, People's Express, the Eastern Shuttle, New York Air, Pan Am Shuttle, etc..). US Shuttle now goes from Terminal B (and its the FIRST stop in Terminal B on the Massport bus - not the second as I originally said), and DL shuttle is out of Terminal A. But the original question was how to get from C to B or A, and that's a bit further or a walk than B to A.