Hmm, I think that figure could be off by a decent amount though depending on what exactly is measured by "utilization". Taxiing, for example, or sitting at the gate with an hour delay.
I think the best way to figure this out is to conduct a little study: set up a script to monitor a representative sample of planes on FlightAware for a while.
Taxiing is included in utilization time, but also in my average transit time (I just took the nautical distance traveled and divided it by the actual transit time).
I think the best way to figure this out is to conduct a little study: set up a script to monitor a representative sample of planes on FlightAware for a while.