| Business | Phone |
| Sierra Mountain Aviation 13308 Nevada City Ave, Grass Valley 95945 | (530) 273-5273 |
| Aircraft Maintenance Training 17260 Ruth Ct, Grass Valley 95949 | (530) 913-1552 |
| Dyn Corp 13120 Loma Rica Dr, Grass Valley 95945 | (530) 274-2678 |
| Rpm Aviation 13046 Loma Rica Dr, Grass Valley 95945 | (530) 273-8371 |