Photos: Atlas 5 rocket aims for International Space Station

An Air Force missile detection spacecraft will, effectively, lose its position in the Atlas 5 rocket’s cramped manifest over the next few months after the flight-worthiness of a thruster on the satellite was called into question and delayed its Oct. 3 liftoff date.

Continuing a series of delays keeping NASA’s Ionospheric Connection Explorer on Earth, NASA announced Tuesday that the satellite’s launch aboard an air-dropped Northrop Grumman Pegasus XL rocket will not occur as scheduled Friday.

SpaceX’s second Falcon Heavy, outfitted to produce more thrust than the heavy-lifter’s debut flight last year, was raised vertical at launch pad 39A in Florida on Wednesday ahead of a launch attempt with the Arabsat 6A communications satellite.