Originally Posted by
VidaNaPraia
Terminal B is a separate building, not connected to any of the other terminals, except by bus on the street afaik. Because of the airport layout, with one-way roads that make a loop, I think the bus goes from Terminal E out of the airport to the blue line T (subway) station, and then returns to enter the airport roads again, stopping at Terminal A and then continuing on to Terminal B (which actually has two sides, each separate from the other).
This is not accurate. All of the terminals at BOS are connected by internal walkways, but they are all landside.
Also, during most times, the bus that connects the terminals (Bus 11) does not stop at the subway, so it would go from E to A to B. During off-peak times, Bus 55 operates, which does stop at the subway station.
Finally, as noted above, the two sides of Terminal B are now connected, both landside and airside.