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While this is an incredible travel speed, I wouldn't consider it "hitting supersonic" speeds based on ground speed. I read the article wondering about the safety of passenger aircraft at 800MPH, but it seems to not apply.
I'm not a pilot, though.
The aircraft isn't experiencing anything out of the ordinary. Its airspeed - which is the speed relative to the air it's moving through - would be the same. It's just that the air is moving relative to the ground along its direction of travel.
Think of it like a boat moving down a river. If you paddle your speed is added to the speed of the current, but the force on the boat is just from you paddling.
good analogy! If that's the case, then I can paddle a canoe 10mph (downstream, with a "tail" wind).
I can fuck in a canoe.