Time for an update. I rented from the EA yesterday afternoon, around 4. Bitter cold - big windchill. The Logan airport location does not have any covered areas for the vehicles, and not a lot of room for that matter. It would be kind fo confusing, but one thing they did have was an attendant waiting there to help you find a car. And they would go out searching for what you wanted, too!
The selection is pretty much all smaller cars - although some more uncommon ones. A handful of Honda Civics, Kias, a few Beetles (been sitting for a while, she said - no one takes them), couple of corollas, she said she could get me a G6 and if I waited they might have a charger coming in, but most of the bigger cars were taken for the holiday week. They also had a few Priuses on the EA. I did not get a chance to check out the ES aisle.