Hyannis Air Service, Inc., operating as Cape Air, is an airline headquartered at Barnstable Municipal Airport in Barnstable, Massachusetts, United States. It operates scheduled passenger services in the Northeast, the Caribbean, Midwest, Eastern Montana and Micronesia. Flights in Micronesia are operated as United Express flights through a code share partnership with United Airlines. Flights between Hyannis and Nantucket, Massachusetts, are operated under the Nantucket Airlines brand, also operated by Hyannis Air Service, Inc.

As of November 2013, Cape Air received $32,241,274 in annual federal subsidies for Essential Air Services that they provided to rural airports in the U.S.

The airline was co-founded in 1988 by company pilots Craig Stewart and Dan Wolf, and investor Grant Wilson. Initially, Cape Air flew between Provincetown and Boston in Massachusetts, but throughout the early 1990s new routes were added to destinations across southeastern New England. In 1994, Cape Air and Nantucket Airlines merged and now offer hourly flights between Nantucket and Hyannis. Services in Florida and the Caribbean were added in the late 1990s.

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