FSX AFCAD File For KOSC, Oscoda-Wurtsmith Airport, Michigan (MI), USA, v1.0. This update was designed with the latest version of ADE (Airport Design Editor) and made for the FSX default airport. Aprons and taxiways updated to reflect the revised GA ramp and Kalitta Air maintenance operations. All changes utilize stock files and requires no additional downloads. By Chris Leipert.