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By the way, 80 knot winds at altitude this time of year are normal. It's not uncommon at all to have a 160 knot jetstream wind in the fall and winter months, with occasional numbers near 180 knots. I've seen groundspeeds in the 650 knot range on a few occasions, while cruising at a normal speed of around 480 knots True Airspeed. That's about 750 statute mph groundspeed.
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