TAS Aviation is a Twin Cesssna maintenance facility located at the Defiance County Airport (DFI), approximately 40 miles SouthWest of Toledo.TAS specializes in the repair and maintenance of all Twin Cessnas.They helped develop and implement the Northwest Ohio Air Network to move bank check work to the Cleveland Federal Reserve Bank. This network is still in operation today. Also, TAS expanded its service by adding charter service for local companies, and backing up other Federal Reserve Bank air networks in the area.The TAS flight department provides ferry flights, airplane deliveries, and pilot service on all Twin Cessnas.