Penobscot Island Air

Penobscot Island Air is a small regional airline based at Knox County Regional Airport, Maine, United States (RKD) operating from a private terminal. The airline operates scheduled service to the islands in Maine's Penobscot Bay and offers private charter land and seaplane flights throughout the region. The airline does not use a designated callsign for ATC communication; instead, it identifies itself using the aircraft's registration number, such as 'November Two Zero Seven Juliet Papa.'