Perhaps, because you do not understand how performance is measured and are offering an incomprehensible rationalization for AC's poor performance. You dismiss overall OTP. Fine. I did not disagree. You then stated OTP should be route specific. Well, that is what I did: I provided a route specific example of KE vs AC on the YYZ to ICN route with KE having a superior OTP in respect to average OTP and extreme delays. This is again demonstrated on the YVR to NRT route AC 3 vs JL 17. Similar departure times, JL flies a slower 767 ( cruise speed ave. 867 kmh) vs AC 789 ( cruise speed ave. 913 kmh). JL is usually ontime, with the worst time delay of about an hour. AC is more likely than JL to arrive late with its worst delay 2 1/2 hours. One won't make the onward connections if flying late with AC, but can do so with a JL flight.