Portal:Spaceflight/On This Day/21 April

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• 1964 - A Thor-Ablestar fails to launch a Transit satellite.
• 1968 - A Molniya-M launches a Molniya-1 satellite.
• 1972 - A Kosmos-2I launches the Kosmos-487 satellite.
• 1981 - A Tsyklon-2 launches the Kosmos-1266 satellite.
• 1982 - A Kosmos-3M launches the Kosmos-1351 satellite.
• 1982 - A Soyuz-U launches the Kosmos-1352 satellite.
• 1987 - A Soyuz-U2 launches the Progress-29 spacecraft to resupply Mir.
• 1993 - A Molniya-M launches a Molniya-3 satellite.
• 1995 - An Ariane 4 launches the ERS 2 satellite.
• 1997 - A Pegasus-XL launches the Minisat-1 satellite.
• 1999 - The Dnepr makes its maiden flight, launching the UoSAT-12 satellite.