621 Knots grounspeed ORD to BTV (Burlington, Vermont) at FL 370, January of 2003. However, coming back, we paid the piper. We flew low at FL 220 to try to mitigate the wind somewhat but still saw 310 knot grounspeeds with a TAS of 450 knots.
Well, last July I averaged 151 knots from Keflavik Iceland to Narsarsauq Greenland in a PBY, that is the highest GS I have ever had in one of those on a long trip in the last 36 years of flying the things.
Not subsonic, but: 1350, no wind/F-14A/South of San Clemente Island, California. Thought it would be just between me and my RIO until maintenance pointed out that the nose cone was devoid of paint after we parked the jet. The jet's a monster above 1.5 mach.
B-747, 705 Kts at level off after departing Japan. Didn't last too long, about 10 minutes before it went to to about 690 Kts. Have heard a lot of stories of very high groundspeeds over the Northern Pacific Area.
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