NASA806 ER-2 over Pa at FL 600 MSL

It's NASA's research high altitude aircraft.

https://www.nasa.gov/centers/armstrong/features/er2-806-retu...

It's a repurposed U-2 high-altitude observation aircraft.

At Flight Level 600, that's 60,000 feet above sea level. Which is really up there for any aircraft.

I believe there are two of these still in operation by NASA.

30 (!) years ago, I met a couple of engineers who were working on an instrument package that was flying on the ER-2 at the time. Measuring atmospheric and environmental conditions of the stratosphere.

I just saw a YouTube video of one of these landing a few days ago, good chance it's the same aircraft!

https://youtu.be/f8uzM-SyZfU