Then you will have to make a decision about what you want to do for yourself. Bearing in mind that the UK has had two public holidays this week, they might be running behind schedule.
You now have to make a decision yourself (which only YOU can make) as to whether you want to spend money on purchasing a new airfare for the Qantas job or not.
You have mentioned previously that you had to say during the one on one interview that you were previously fired from a job, and that you are worried as to whether that might stop easyJet from employing you. You are now considering putting all of your eggs in the big orange basket and not going to the Qantas interview.
Personally, I would attend the Qantas interview because you now have an IDEA about airline recruitment interviews, so you could potentially ace the assessment day/interview with Qantas.
Put it this way, if easyJet don't recruit you and you have snubbed the Qantas interview, will Qantas want to then invite you to attend another interview in the future?