Live coverage: Two Russians, one American arrive at space station

Preparations for the planned liftoff Thursday of a SpaceX Dragon capsule with a four-person crew to the International Space Station cleared another readiness review Tuesday at NASA’s Kennedy Space Center in Florida, but officials are tracking marginal wind and sea conditions in downrange abort zones in the Atlantic Ocean that could force a launch delay.

A Falcon 9 rocket was raised into position at pad 39A on Sunday for a customary test firing of its nine first stage Merlin engines. The rocket is being readied for a launch Thursday with a Dragon capsule carrying supplies to the International Space Station.

Two panels of managers and scientists presented details of SpaceX’s 16th operational resupply flight to the International Space Station on the eve of its launch aboard a Falcon 9 rocket from Cape Canaveral.