Aircraft Owners and Pilot's Association - USA
- A national pilot organization representing general aviation (business and personal), with news and other aviation information. Also features new and student pilot learn-to-fly tips.
- http://www.aopa.org/

Frederick Aviation
- Provides aircraft charter, management, maintenance and ground services along with aircraft sales. Includes details of available services and on-line aircraft sales inventory with pricing.
- http://www.frederickaviation.com/