Squark7700,
"I've never seen anyone base parking / hangarage on the aircraft's hourly usage.
Are you charging parking / hangarage by VDO or Airswitch?"
Is the new thing works great, it is time from touch down to time of take off.
It is $20 per hr min charge $100, all profits go back into airport improvements. I understand the next airports it will be implemented at are the ones with flying schools.