Duffy's Aircraft

Duffy's Aircraft is a family-owned Fixed Base Operator (FBO) and flight training provider based at the Marshfield Municipal Airport, (KMFI), Central Wisconsin. Founded in 1974 by Harold "Duffy" Gaier and Alice Gaier, the company has grown into one of the region's longest-established aviation businesses while remaining family operated. We provide flight training, aircraft rental, aircraft refueling, and PSI FAA Computerized Testing Services. We train students all throughout the year.