[svandamme]

it is "a" metric
Closing boarding, and pushback is one thing
actual wheels off the ground another
as is touching down safely
at the right destination
on time

Data systems can only report metrics that happened already.

What you see
is not what the people see who are doing the performance metric business.

you get public FYI
and that is just a small part of the story..its For YOUR Information
its not For Airline Performance Metrics