Question: Bar Harbor is a town on Mount Desert Island in Hancock County, Maine, the town is served by the Hancock County-Bar Harbor Airport, which has flights on PenAir, and Hyannis Air Service, Inc., operating as Cape Air, is an airline headquartered at Barnstable Municipal Airport in Barnstable, Massachusetts, in which country? 
Sentence (from "Cape Air"): Hyannis Air Service, Inc., operating as Cape Air, is an airline headquartered at Barnstable Municipal Airport in Barnstable, Massachusetts, United States.
Relevant evidence: Yes