Live coverage: Atlas 5 countdown and launch journal

The Atlas rocket to launch four formation-flying spacecraft for NASA in March began to take shape Wednesday at the assembly building adjacent to the Complex 41 pad.

Tucked inside a shipping crate aboard an Air Force C-5 transport aircraft, the Navy’s next mobile communications satellite has flown from California to Florida in preparation for liftoff this summer.

SpaceX performed a hold-down test-firing Jan. 20 of a Falcon 9 rocket at Cape Canaveral in preparation for a launch with 60 Starlink broadband satellites, but officials delayed the missions’s planned launch Tuesday due to extreme weather in the downrange recovery zone for the first stage and payload fairing. The next possible launch attempt is expected at 9:49 a.m. EST (1449 GMT) Monday.