| Jane's Information Services Ltd |
| JCS-Echigo Pte Ltd |
| Jebsen & Jessen (SEA) Pte Ltd |
| JEC |
JEP Precision Engineering Pte Ltd |
| Jet Aviation |
| Jordan Airmotive Limited Company |
| Kallman Worldwide |
| Kaman Fuzing Division |
Kazan Helicopters |
| Kearsley Airways Ltd |
| KEDDEG |
| Kellstrom Industries |
| Kerns Manufacturing |
Kim Ann Engineering Pte Ltd |
| Kongsberg Defence & Aerospace AS |
Korea Aerospace Industries Association (KAIA) |
Korea Aerospace Industries Ltd |
| Kulite Semiconductor Products |
L-3 Communications |
| L-3 Wescam |
| Lameco |
| Latecoere Groupe |
| Laversab |
| Leki Aviation |
| LH Intercoat |
| Liberty Aerospace |
| LITEF |
LKT Ergonomic System Pte Ltd |
LKT Technology Sdn Bhd |
Lockheed Martin |
Lord Corporation |
| Lufthansa Technik AG |
| Lufthansa Technik Intercoat |
Lumos Technology Co Ltd |
