Falcon 9 abort seen from press site

SpaceX called off the planned launch of a Falcon 9 rocket Saturday less than 15 seconds before liftoff to investigate the “slightly odd” behavior of the vehicle’s upper stage engine steering system, company chief Elon Musk said.

SpaceX’s launch of the Starlink 6-56 mission will move the company past the total number of Space Shuttle Program missions from Launch Complex 39A. Liftoff is set for 2:42 p.m. EDT (1842 UTC).

Passing a major pre-flight milestone ahead of a launch and landing planned early Sunday, a SpaceX Falcon 9 rocket ignited its main engines Wednesday for a hold-down firing at Cape Canaveral.