Originally Posted by
LAX UA 1K
There are "on time departures" and "on time arrivals", which I think is defined as arrival at gate no more than 15 minutes behind the schedule.
Thanks for the clarification. It's unclear which statistic United refers to when they say a flight is "80% on-time" or what-not... I suspect they're referring to on-time departures rather than arrivals, but it's not readily apparent. Regardless, taxi and slot delays must be taken into account, as you have verified.