Not that SpaceX or Iridium will necessarily mind. The two want to know that the first Falcon 9 launch since the September explosion will go off without a hitch, both to protect the valuable payload (an Iridium Next satellite) and to show that Elon Musk's private spaceflight plans are back on track. It also gives some extra opportunity to verify the helium loading changes intended to prevent another disaster. Waiting several days will be worthwhile if it sets minds at ease in the long run.

High winds and rain in forecast at VAFB. First launch of #IridiumNEXT now planned for January 14th at 9:54:34 am PST. #NEXTevolution. — Iridium Corporate (@IridiumComm) January 8, 2017