Weather in the 21st century

My question about the following story is whether jet aircraft have even been tested at flying over 800 mph?

https://www.sciencealert.com/a-powerful-jet-stream-just-rocketed-a-plane-to-a-to...

Dr. Daniel Swain of UCLA is tracking unusual winter storm activity across California:

https://weatherwest.com/

>1 MaureenRoy: Good point! I assume they account for influence of the jet stream in some way when they test the stability of the aircraft.

Agreed. A jet stream speed of 800 mph, however, also makes me wonder if the jet aircraft's wings are in danger of being ripped off on leaving the jet stream.

In my previous work with the LT Sustainability group, I did read that around 300 mph is the upper limit for tornadoes on Earth. At that time I never realized that Earth's jet streams could easily exceed that speed. Wowsers.