Originally Posted by
United747
Not sure why United's are so much slower - LH says 840 kph (~522 mph) and Delta says 525 mph
All else being equal, that should only mean about a five minute difference in flight time on an 1,800 mile flight (roughly ORD-SFO)
still be compared to a 787 that’s nearly 42MPH. 25-30 mins in a transcon is marginally significant IMHO