On a slightly different tack, could someone in the know please explain how NATS arrives at its much trumpeted reduced delays due to ATC? I.e. these various nebulous figures such as average delay reduced by 10 seconds to 25 seconds per aircraft.
The CFMU has figures on the delays due to an Air Navigation Service Provider, as well as the number of aircraft which transitted airspace where it controls.
You divide the delay by the number of aircraft and then get an average delay figure per aircraft.
Simple really !!
This is reported to relevant organisations by CODA (Central Office for Delay Analysis). The receiving organisation can then use the figures as it see fit.
More here :
CODA