The Terminal-to-Terminal shuttle now operates from the departures level. (I work at the airport, so hopefully you'll trust me on this one. ) After you've deplaned, head towards the rightmost set of the doors to the departures curb. Flag down the white and red Terminal-to-Terminal shuttle -- it runs every 5-10 minutes. The next stop on the route should be the McNamara Terminal -- right outside the Westin.