Are these aircraft not a case of build it and they will come? A320s are increasingly becoming the weapon of choice for big miners in the West, particularly following narrow runway provision. Most (not all) Pilbara runways are 30m wide and +1500ft elevation, and the A320 on a closed charter basis makes much commercial sense for miners, over the B737. Network clearly want in and will make good ROI on these machines if they're successful in tapping into to this market. (IMO)