Is there any particular reason as to why there are no flights from Sydney - Brisbane on Thursday the 14th of Nov after 3pm?

Is there any particular reason as to why there are no flights from Sydney - Brisbane on Thursday the 14th of Nov after 3pm? Surely they are not already booked out?

Plenty of DJ and JQ flights available.  Not sure why there is no availability on QF.

I'm sure it's possible they're all sold out. I was looking at the booking engine for SYD-MEL Mon 28 Oct 13 the night before, and the 0700/0715/0730/0745 flights weren't showing at all. But when I flew on Monday morning, all flights except the 0715 (cancelled) did in fact operate.

ExpertFlyer seems to show availability on later QF flights, and I can find them on OTAs such as Expedia.

It seems that Qantas' fiddling with their booking engine today has created some bugs.

Or that! The sale engine keeps changing from the old UI to the new UI, and at one point was displaying to me in a mix of Chinese and English.