SpaceX Sends 4 Astronauts To International Space Station

The video discusses SpaceX's first operational flight for NASA, marking a significant milestone in private spaceflight. The mission is expected to reach the International Space Station and stay until spring. NASA plans a series of Dragon missions over the next 15 months, signifying a new era in human spaceflight. The launch, initially scheduled for Saturday, was delayed due to weather concerns.

What does NASA hope to achieve with this series of flights?

What does the phrase 'a new era in human spaceflight' refer to in the context of the mission?