Sorry for the delay for part two.
Qantas domestic first and business (again and again)
I booked a few tickets on an opportune great fare that was a good status credit earner at just the time I needed them. While it was (just) possible to do a same day return, it would have been a long day (up by 3am for early departure and not back until around 1am next morning) and reliant on some short connections. So instead I chose to spend a weekend away each time, with the added bonus of being able to fly domestic legs of international flights. This means a longhaul seat instead of shorthaul, spend more time in first class lounge instead of domestic lounges, and no annoying international to domestic transfer at SYD (which takes anywhere from 30 to 90 minutes).
As the fare worked well for me, and I enjoy the particular destination, I booked a few of these.