| Business | Phone |
| Arcom Enterprises Inc 6251 W Forest Home Ave, Milwaukee 53220 | (414) 543-5604 |
| Condor World Aviation Svc 555 W Layton Ave # 450, Milwaukee 53207 | (414) 855-0804 |
| Derco Aerospace Inc 8000 W Tower Ave, Milwaukee 53223 | (414) 355-3066 |
| Milwaukee Aircraft Instruments 4951 S Howell Ave, Milwaukee 53207 | (414) 769-0602 |