- 22 November 1969 Skynet 1A Spacecraft: NATO 1. Mass: 243 kg. Launch Site: Cape Canaveral . Launch Vehicle: Delta M. More details
Over Indian Ocean. Military communications. Previously registered by the United States in A/AC.105/INF.220: 1969-101A, orbital data 276 x 36716 km x 28.0 deg, category C.
- 19 August 1970 Skynet 1B Spacecraft: NATO 1. Mass: 243 kg. Launch Site: Cape Canaveral . Launch Vehicle: Delta M. More details
AKM failure left in unusable orbit. Spacecraft engaged in practical applications and uses of space technology such as weather or communication (US Cat C).
- 19 January 1974 Skynet 2A Spacecraft: Skynet. Mass: 129 kg. Launch Site: Cape Canaveral . Launch Vehicle: Delta 2914. More details
Partial Failure. Failed to reach planned orbit.
- 23 November 1974 Skynet 2B Spacecraft: Skynet. Mass: 129 kg. Launch Site: Cape Canaveral . Launch Vehicle: Delta 2914. More details
Military communications.
- 11 December 1988 Skynet 4B Spacecraft: ECS/OTS. Mass: 1,433 kg. Launch Site: Kourou . Launch Vehicle: Ariane 44LP. More details
British military communications; 1 deg W. Military communications.
- 01 January 1990 Skynet 4A Spacecraft: ECS/OTS. Mass: 1,463 kg. Launch Site: Cape Canaveral . Launch Vehicle: Titan 34D. More details
British military communications; 6 deg E. Military communications. Expected life approx 7 years. Owner/operator: Ministry of Defence, Main Building, Whitehall, London SW1A 2HB.
- 30 August 1990 Skynet 4C Spacecraft: SECS/OTS. Mass: 1,463 kg. Launch Site: Kourou . Launch Vehicle: Ariane 44LP. More details
UK military communications; 1 deg W. United Kingdom military communications satellite. Owner/operator: UK Ministry of Defence. Expected operational life 10 years.
- 10 January 1998 Skynet 4D Spacecraft: ECS/OTS. Launch Site: Cape Canaveral . Launch Vehicle: Delta 7925 . More details
Geostationary at 52.8 degrees E.
- 26 February 1999 Skynet 4E Spacecraft: ECS/OTS. Mass: 1,490 kg. Launch Site: Kourou . Launch Vehicle: Ariane 44L. More details
Skynet 4E was a SHF/UHF military communications satellite for the UK Ministry of Defense. Dry mass was 759 kg; it used a Thiokol Star 30 solid apogee motor. Stationed at 53 deg E.