| Company | Location | DAR | DER | Services |
| ACC | Massachusetts | - | DER | TBA |
| ACDI | USA | - | DER | TBA |
| Aero Tech Aviation Design LLC | Kansas | - | DER | TBA |
| Aeronautix LLC | Kansas | - | DER | FAA certification program management |
| Aircraft Engine Support | Texas | - | DER | TBA |
| Airplane Certification Services, LLC | Texas | DAR | DER | TBA |
| Aldrich Aerospace Inc. | Arkansas | DAR | - | Maintenance and Manufacturing DAR Services, Airworthiness Certificates Standard, Research and Development, Show Compliance, Experimental, Import, Export, Special Flight Permits, STC Conformity, Weight Limitations NONE |
| Aviation-Piedmont Consulting | North Carolina | - | DER | FAA-delegated engineering approvals and project management |
| Aviation Aircraft Certification Consultants | Memphis | DAR | - | Special flight permits, export certificates |
| Aviation Quality Group | Ohio | DAR | DER | TBA |
| Avionics Support Group | Florida | DAR | DER | Engineering, STC Development, 8110-3 forms, Installation Conformity and Parts Conformity |
| Avsource Group | Colorado | DAR | DER | Std/Export Certificates, special flight permits |
| AvSpec Corp | California | - | DER | Repairs, Alterations and Modifications for Structures and Systems |
| Callahan Aircraft Services LLC | Alabama | - | DER | TBA |
| CertTech LLC | Kansas | - | DER | TBA |
| Cotney Aerospace | Alabama | - | DER | TBA |
| CSI Inc. | Washington | - | DER | TBA |
| DART Aviation Services Inc. | Florida | DAR | - | Recurrent airworthiness certification, Export certificates, special flight permits |
| Davidson Engineering Resources | USA | - | DER | Field Approvals (Form 337), STCs, damage tolerance assessment, aging aircraft |
| DER Associates | USA | - | DER | STC project certification and PMA production approval |
| DERS Group Svc Inc | Indiana | - | DER | FAA Engineering design and FAR compliance review for Engines, Structures, Systems, and Power plants |
| ENSCO Inc. | USA | - | DER | TBA |
| Flight Pro Consulting Services LLC | Virginia | DAR | - | Special Flight permits, Aging Aircraft Inspections, Expert Witness, Export certificates, Records Audits, FAA 121,135, 133, 145, 129 ICAO, IATA/IS-BAO Regulatory Compliance Audits, issue Standard/Special Airworthiness Certificates up to 875,000 MTOW |
| FTA Inc. | California | - | DER | TBA |
| Future Aerospace Services & Technology Inc | Texas | DAR | DER | STCs, mods, repairs, airworthiness certificates, imports/exports |
| GC Aviation | Tennessee | DAR | - | Special flight permits, export certificates, standard airworthiness certificates |
| Graybeard Consultants | Texas | DAR | DER | TBA |
| Herb Curry Inc. | Indiana | - | DER | Flammability and smoke toxicity certification |
| High Rely | Arizona | - | DER | DO-178B and DO-254 expertise |
| Highborne Flight Systems Inc. | California | - | DER | TBA |
| NNC Inc. | Arizona | - | DER | TBA |
| Lawson Aerospace | New York | - | DER | TBA |
| Paladin Aerospace | USA | DAR | - | Tech appraisals, asset management, audits |
| Paragon Transportation LLC | Arizona | - | DER | Aircraft, design and production approvals for Structures, Power Plants, Radio and Engines |
| Patmos Engineering Services Inc. | Washington | - | DER | Software and hardware data and tools |
| Rakab DER Services | Texas | - | DER | TBA |
| Randy Harper Aerospace | Texas | - | DER | TBA |
| Seneca Aeronautical Services LLC | USA | - | DER | TBA |
| TASS Inc. | USA | - | DER | Repairs and Alterations, FAA/EASA Approvals, STCs in all engineering disciplines, Damage Tolerance, Fatigue, Maintenance Program Optimization |
| The Drake Group | Nevada | DAR | DER | Mechanical systems, equipment and interiors |
| ThistleGreen Technologies Inc. | Arizona | - | DER | Structures |
| Underhill Consulting LLC | Wahsington | - | DER | TBA |
| WDARS | USA | DAR | - | DAR services, records audits/inspections, expert witness |
| Web Aeronautical Inc. | Florida | DAR | - | Aging aircraft inspections, certificates, exports |