• N391AC de Havilland Canada Inc., Downsview, ON. Rolled out date 11-Jul-1979. First flight 21-Sep-1979.
• N391AC Delivered to Ogden & Coyle, 05-Oct-1979.
Note: Shown as Ogden & Coyle but possibly Ogden Coyle Trucking of Ogden, Utah.
• N391AC Operated by Aero Contractors, Smithfield, NC., [Ogden & Coyle] 05-Oct-1979.
• N391AC Aero Contractors, Smithfield, NC. [Devon Holding & Leasing Inc.,, Lexington, NC] Transferred 05-Feb-1996.
• N6292Q Re regd to Aero Contractors, Smithfield, NC. (Devon Holdings, Lexington, NC),1996.
• N237JR Re regd to Aero Contractors, Smithfield, NC, (Devon Holdings, Lexington, NC), 21-Apr-1998.
• N237JR Sold to Courtland Air Services, Cleveland, OH., May-2001.
• N6151C Re regd to Courtland Air Services, Cleveland, OH., 13-Jun-2001.
• N6151C Sold to Aviation Specialities, Washington, DC., 05-Jul-2001.
• N6151Q Re regd to Aviation Specialities, Washington, DC., 03-Aug-2001.
Airworthiness date 17-May-2011 Standard - Aerial Surveying.
• N6151Q Sold to Twin Otter Support Seriesvices LLC., Las Vegas, NV., 05-May-2011.
• N633AR Re regd to Twin Otter Support Seriesvices LLC., Las Vegas, NV., Regd 06-Jun-2011.
Note As at 22-Jan-2017 Two internal metal fuel tanks were installed in the centre of main cabin. No particular reason given.
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