SpaceX Launches First Mission of 2019

The video covers a SpaceX launch from Vandenberg, highlighting the countdown, lift-off, and stage one separation. The launch is part of the final installment of the Iridium satellite constellation, which includes secondary payloads. The discussion shifts to the upcoming Crew Dragon launch, marking a significant milestone for SpaceX and NASA, as it will be the first US astronaut launch since the Space Shuttle's decommissioning.

What is the importance of the Iridium satellite constellation mentioned in the text?

What milestones are highlighted for both SpaceX and Boeing in the context of commercial crew business?