Airline data analysts would certainly use vastly more precise data than a single number all routes, timetables and plane types, which also ignores weather, security and other extenuating circumstances. They have all this information available to them, why would they ignore it?

Again, repeating myself: OTP is an extremely reductionist number that doesn't have any usefulness outside of giving outsiders something to argue about.

Case in point:

Yeah, it's incomprehensible -to- -you- because -you- want to reduce all the complexities of why planes can be late down to something simple enough to start an Internet argument over.