The 787 aircraft cruising speed is around 561 mph.... But on February 18, 2019 the jet stream was doing about 231 mph over Pennslyvania to Long Island New York.... A Virgin Atalntic flight from Los Angles to London heading towards the East Coast at 35,000 feet before … [Read more...] about A Virgin Atlantic Boeing 787-9 did 801 mph during a LAX to London flight…..