Boreal Aviation, Inc Share: Boreal Aviation, Inc Visit Website Request Info 401 Ave F Gwinn, MI 49841 (906) 346-6440 Hours: Sunday-Saturday 8:30 a.m. - 8:30 p.m. About Map About Boreal Aviation, Inc. is located at the Sawyer Airport (KSAW) in the General Aviation Terminal. Our 8,900 square foot facility is in the heart of Michigan's Upper Peninsula. We specialize in aircraft services, calibrations, and aircraft maintenance. What's Nearby? Distance: 5 10 15 20 25 50 mi.