Cape air marion il with its main office at Barnstable Municipal Airport in Barnstable, Massachusetts, the United States, is called Hyannis Air Service, Inc doing business as Cape Air. In 1989, the airline was established. In the Northeast, the Caribbean, the Midwest, Eastern Montana, and Micronesia, it runs regular passenger flights. Through a code-share agreement with United Airlines, flights in Micronesia are run as United Express flights.You will also find the contact details and instructions for booking, changing, and canceling flights at the cape air Offices useful.