Originally Posted by
sunnySA
It's called affordable safety. Flight out of ATC hours costs less than a flight when the TWR is open. Simple maths. If ASA changed the opening hours then the airlines would reschedule their arrival times to earlier. Same, same for closing times. Business hours means that either a single ATC could operate the TWR, or maybe 3 ATCs over slightly longer hours. Extend further then you probably need a 4th ATC per day.
I guess I just hold an old fashioned view that Airservices are there to provide a service (not a dig at individual controllers of course, just the system). It seems somewhat pointless operating outside the hours of major passenger movements