The SR-71 "Blackbird" holds the record for flying from New York to London in 1 hour 54 minutes and 56.4 seconds, set on 1 September 1974. This equates to an average velocity of about Mach 2.68, including slowing down for in-flight refueling. Peak speeds during this flight were probably closer to the declassified top speed of Mach 3.2+. (For comparison, commercial Concorde flights took around 3 hours 23 minutes, and the Boeing 747 averages 6 hours 15 minutes.)
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