Hi
@PerthPaul and welcome to posting on AFF.
I have done a fair bit of travel on crutches, and my adult daughter also unfortunately broke her ankle (playing competitive frisbee
)
before a planned family ski trip to Japan in 2018 but went anyway. So I can say from my experience that Qantas are very good at supporting people who need a bit of an extra hand eg carrying cabin bags, early boarding etc. It's worth calling them and letting them know about your needs in advance. Also worth asking if you can have an extra leg room seat - you won't qualify for an emergency exit row with a mobility disability, but there are other seats that are a bit better in terms of leg room than just random seat selection. You may have to pay, but even if the seats are already allocated to others, they might 'bump' that person and refund their money and give you the seat on the basis of need, if you ask - a bit like how they allocate the seats with baby bassinets to whoever books them, but then bump if an actual parent with an infant needs the bassinet. Also the curb to gate to curb wheelchair assistance gets you whisked through immigration and security (departure) and immigration and customs (arrival) much faster and avoiding lots of long lines - even if you are last off the plane, you will still be faster through various clearances in my experience. I expect you've done it before, but do allow extra time to pass through security, as I am sure you will get fairly thoroughly checked out by the security staff, and that can take a while. I hope you have a good experience, and I really really hope the trip goes ahead.