Originally Posted by
global2express
... the pilot's slurred speech hints towards hypoxia in my opinion.
https://aviation-safety.net/database...?id=20210109-1
"The aircraft was cleared to climb to FL230 by Seattle Center but continued to climb until it reached FL310 twenty minutes after takeoff. At that point ADS-B records show that the aircraft began a descending right hand turn that ended in the aircraft spiraling down until it impacted terrain."