Besides NASA’s spectacular delivery of the perseverance rover to the surface of Mars, there was a lot going on in spaceflight this week. The ISS received two visitors, Starlink continues to build their constellation, and Paraguay joined the satellite club.Closer to Earth, Pratt and Whitney turbofans suffered uncontrolled blade failures on Boeing 777 and 747 aircraft in two separate incidents, prompting a grounding pending investigation.And the Biden administration controversy only reversed a Trump administration ruling, giving labour unions more control over US apprenticeship programs.Access all episodes of This Week in Engineering on Engineering TV along with all of our other series.