Luftfart
- og rumfart
- The Aviation Herald
- Flight Safety Foundation
- Aviation Safety Network
- LH Luftfartssektionen
- EASA Continuing Airwortiness
- EASA Technical Publications
- Technik Museum Speyer, Frankfurt
- OpenSky Network ADS-B Data
- DESCANSO, Deep Space Communications and Navigation Center of Excellence
- SpaceAholic - The site and collection reflects interest areas in he U.S. Manned Space flight program
- NASA's Technical Resource Server
- The European GNSS Agency