Originally Posted by
asdf1234
If you look at the approach tracks on Flight Radar or similar I would be very surprised if the overnight cargo flights are making use of a continuous descent approach. Maybe someone with more technical ability than me could extrapolate the data and comment?
The 734 should exhibit the same noise characteristics as a 738, which are both louder than an A319 or 320.
Of course the approach is not the reason why locals are concerned about increased noise levels overnight. It is the use of reverse thrust on landing and then the subsequent take-off after a very quick turnaround, all pre-dawn.
Maybe a freight driver could comment on why the ASL flights are noisy in comparison to others? The -400 is a relatively old design but on paper they should not be noisier than a -800. Do freight operators insist on TOGA throttle settings whereas LoCo operators are more fuel/cost conscious with their takeoff performance?