J
- J & AS, J & AS Aero Design Sp z oo – Poland
- Jabiru, Jabiru Aircraft Pty Ltd – Australia
- Jackaroo, Jackaroo Aircraft Ltd – United Kingdom
- Jag Helicopter, JAG Helicopter Group LLC – United States
- James, James Aviation – New Zealand
- Janowski, Jaroslaw Janowski – Poland
- Javelin, Javelin Aircraft Company Inc – United States
- JDM – see Avions JDM
- Jeffair, Jeffair Corporation – United States
- Jeof srl, Candiana, Italy
- Jetcrafters, Jetcrafters Inc – United States
- Jet Pocket, Chantelle, Allier, France
- Jetprop, Jetprop LLC – United States
- Jetstar, Jetstar Inc Australia
- Jetstream, Jetstream Aircraft Ltd – United Kingdom
- Jingmen Aviation, Jingmen, China
- Jodel, Avions Jodel SA – France
- Jodel, Société des Avions Jodel – France
- Johnson, Johnson Aircraft Inc – United States
- Johnson, Johnston Aircraft Service – United States
- Jojo Wings, Roudnice nad Labem, Czech Republic
- Jordan Aerospace, Jordan Aerospace Industries – Jordan
- Jovair – United States
- Junkers, Junkers Flugzeug- und Motorenwerke AG – Germany
- Junqua, Roger Junqua – France
- Jurca, Marcel Jurca – France
- Just Aircraft, Walhalla, South Carolina, United States