as a single stage if not carrying the upper stage and a heavy satellite.

Launch and on-orbit test

Flight 20 was launched on 22 December 2015 at 01:29 UTC (21 December, 8:29 pm local time).

Second stage re-ignition

Following successful launch and deployment of the OG2 satellites, the Merlin Vacuum (1D) second-stage engine successfully re-ignited, demonstrating its capability to launch SES-9 into geostationary transfer orbit.

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