Stats: Atlas 5 and Delta 4 histories and backlogs (updated April 20)

SpaceX’s Falcon 9 rocket is awaiting liftoff from Cape Canaveral’s Complex 40 launch pad as soon as Tuesday after three scrubs caused by propellant loading problems and a boat that strayed into restricted waters in the Atlantic Ocean.

NASA has decommissioned a long-lived satellite launched in 2000 that demonstrated remote sensing and surveying instruments and techniques common in today’s orbiting Earth observatories.

The International Space Station crew releases the Cygnus OA-7 commercial cargo ship from the Canadian robotic arm to begin free-flight away from the lab complex, completing 43-day visit that delivered supplies, food and science gear.