http://www.demorgen.be/wetenschap/vlieg ... -a2176278/
British Airways Flight 114, a Boeing 777-200 jet, took off from JFK at 10:50 p.m. ET, and landed at 9:06 a.m. local time, taking just five hours 16 minutes to make a trip that typically takes more than six hours.
At one point, according to Flight Aware, the jet was traveling at a groundspeed, which is the speed at which the plane is traveling relative to ground level, of 745 miles per hour.
For comparison, the speed of sound at sea level is 761 miles per hour.