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SpaceX says cargo launch ready, hopes to “nail the landing” this time

Koenigsmann estimated that only about one-third to one-half of SpaceX flights with the Falcon 9 rocket will have enough fuel margin to return to land.The company is also closely watching Friday's launch because it marks only the third flight of its upgraded Falcon 9 rocket.

Watch live: SpaceX to launch, hopefully land its rocket today

With an instantaneous launch window that opens and closes at 4:43pm ET (9:43pm BST) today, SpaceX will attempt to send its Falcon 9 rocket and Dragon spacecraft soaring into space.According to today's flight profile, the first stage main engines will cutoff at 2 minutes, 30 seconds after launch.