| Business | Phone |
| Arrowhead Engineering 760 E Francis St, Ontario 91761 | (909) 773-1069 |
| Keystone Engineering 1600 Excise Ave, Ontario 91761 | (909) 937-0094 |
| American Aerospace Quality Crp 1679 E 5th St, Ontario 91764 | (909) 865-0883 |
| Panob 1531 E Cedar St, Ontario 91761 | (909) 947-4098 |
| Victory Aviation Inc 4315 E Lowell St, Ontario 91761 | (909) 937-3688 |