If it was my train-set I’d be looking closely at the MRJ
I am not sure I would want to be the first in Australia to introduce a new type with the regulatory pain that would cause. The Embraer jets are known and proven, already operated in Australia with some experienced crews and engineers. The A220 would be interesting, the manufacturer would be very keen I am sure, lots of assistance.
Alliance have done well as a niche carrier and they seem to be able to capitalise on opportunities very well. They are, however, like a trucking company with a fleet of very old trucks that will be off the road shortly. The lease costs of new generation jets will be a shock.