STS Services, Inc. - Specializes in the recruitment and staffing of skilled aviation technicians under contract to the aerospace industry since 1981

STS Component Solutions, LLC. - a global leader in the aerospace industry, specializing in materials management, OEM Distribution and supply chain management solutions.

ATR Aviation -  specializing in Scheduled and On-Call Maintenance Operations for Commercial, Regional, and Corporate Aircrafts.  Contract Services include Layover Checks, NDT Inspections, Turn-Around Checks“A” and “B” Checks
 Non-Routine Discrepancy Report and ground support equipment maintenance and repair, tailored to each individual customer.

MOS Engineering LLC - Our new approach to aerospace engineering enables top engineers from around the globe to collaboratively work on your projects. Through our "Virtual Engineering Model", companies now have access to world-class engineers and DER’s with lower direct costs and quicker response times than provided by the OEM. We can also supplement your engineering organization on an as-needed basis to curtail costs.

STS Engineering Inc. - Providing quality engineers to meet the demanding needs of the aerospace industry. STS Engineering technical professionals include engineers, designers, drafters, project managers, tool designers, illustrators, and CAD operators. STS Engineering provides skilled, dependable, dedicated, professional employees accompanied with an experienced, knowledgeable, responsive service team.

AeroTrain, Inc. - Provides maintenance and organization for online (web-based) retrieval of training documentation (OJT, FAM, OSHA, etc.)

Airplanes, Inc. - The total maintenance personnel solution provider via on-site/integrated personnel and compliance management of contract labor.

STS Holdings, Inc. - Oversees six operating divisions that provide staffing and compliance services specifically and exclusively to the aerospace industry.