From what I understand, they had a window on Friday, a fallback window on Saturday. If they missed the Saturday launch, then the mission would go to Orbital.

From what I understand, they had a window on Friday, a fallback window on Saturday. If they missed the Saturday launch, then the mission would go to Orbital. Maybe they technically could have waited until Saturday, but there is no way they would scrap one of their windows for a tertiary objective.