Thanks, Blumie -- I do take a taxi when I get to Logan (about once a month it feels like!) but this is for Spanish friends with limited English.
And I think you are low on the current costs. The meter usually reads about 32-35 USD on the way in, and perhaps 6 USD less on the way out (to the airport).
I'm keen for them to have a smooth experience and so would like to set up a car service.
I have tried Boston Coach in the past and yes, they are NOT the low-cost supplier.
Thanks for the help. Any other ideas out there?