Originally Posted by
tanri
If you have a lot of extra time, definitely take the Silver Line; you'll get a slow motion tour of the most boring parts of Boston, and you might sort of feel like you're in a big non-posh limo because you may well be the only passenger onboard.
If you do want the quickest route, just walk a couple blocks to the Aquarium stop and hop the Blue Line two stops to the airport right away. Theres a reason the Blue Line is crowded and the Silver Line is empty.
Obviously, locals differ on this. When I'm at South Station (since I live south of Boston, that happens more than once in a while) I always* take the Silver Line to the airport. The Blue Line is a fine way to get to a transit station named "Airport," but that station is outside the airport proper. Once you get there, you have to wait (it can seem like forever) for the bus that takes you to the airport itself. The Silver Line drops you off where you want to be.
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*Added in edit for the logic nit-pickers, of which FT has its share: Obviously, "always" refers only to when I want to get to the airport.