On home front domestic Qantas flights have been very good.
This is an very old "thanks Qantas" but still valid. I was in Sydney working, and hubby had just had a very major operation in Grafton. I was booked to fly back on day x before his release. Sudden phone call: "I've signed out of hospital" (3 day x operation - should never happened - men!). Panic stations. Called Q. all the way out to Mascot - couldn't get through.
Straight through security to the lounge - explained the situation. "Nothing available but there may be a no show - stick around". Another Pax walking around also clearly wanting a seat.
At the last moment, they said to pax "Nothing". Pax walked away, then they motioned me and said: "Run!".
I've always been very grateful to Qantas for this (and sorry for the pax who was denied boarding).