Yep site is borked for booking flights and reviewing previously booked flights. Award bookings still look ok.

The issue is that a transaction server called "book.qantas.com.au" is not responding.

It's not even in the DNS, so your computer can't find it.

I don't recall "book.qantas.com.au" being used before for bookings. Has IT been making more changes without proper testing again?