a couple of hundred people being stranded
Try a smidge under 500- the 413 is operated by A380.
Having been on the wrong end of the Sydney curfew several times (on both large & small aircraft) it is not a fun experience to tell the pax that they are not going anywhere until the next morning- especially if they have been delayed earlier in the day.
The sooner they make exceptions for ULR flights the better. Not so bad for a Syd-Mel, but it still affects operations with crews & planes being in the wrong place and stuffing up the schedule for a day or two afterwards (in the case of QF or DJ)