487 miles per hour would only be 0.63 Mach which is very slow. 487 knots would be 0.73 Mach which is much closer to the rule of thumb 0.78 Mach cruise speed ex

487 miles per hour would only be 0.63 Mach which is very slow. 487 knots would be 0.73 Mach which is much closer to the rule of thumb 0.78 Mach cruise speed expected. https://krepelka.com/fsweb/learningcenter/aircraft/flightnotesboeing737-800.htm https://krepelka.com/fsweb/learningcenter/aircraft/flightnot... (and yes, it's a simulator but it's still good for real world)