All airlines are serviced at Logan International Airport in East Boston. It costs about $25.00 for a taxicab ride to the Boston Park Plaza Hotel.
The MBTA transportation system in Boston allows one to ride from the Airport to the Hotel but multiple changes are required. From the airport terminal, busses run to the Airport MBTA Station. From there the Silver Line takes you to South Station. Next, take the Red Line to Park Street and then the Green Line underground trolley to Arlington Street Station.
This will take about an hour depending upon the time of day at about a fraction of the cab fare. It is recommended only for the more adventurous attendees or railroad aficionados. http://www.mbta.com/traveling_t/schedules_subway.asp.