The jet was boosted by a powerful jet stream across the eastern US states, which clocked in at 231mph, the fastest for half a century, according to the National Weather Service in New York.
This added tailwind increased the speed of 3,500-mile-long Virgin Atlantic flight VS8 from Los Angeles to London Heathrow, which at one point hit 801mph while over Pennsylvania.
It could mark a new record speed for a Boeing 787 Dreamline aircraft, according to CBS News.
The typical cruising speed of a Dreamliner is 561mph.